Can. J. Anim. Sci. Downloaded from by on 11/26/17. For personal use only.

Size: px
Start display at page:

Download "Can. J. Anim. Sci. Downloaded from by on 11/26/17. For personal use only."

Transcription

1 IDENTIFICATION OF OVARIAN FOLLICLES AT ESTRUS AND DEVELOPMENT OF THEIR ENSUING CORPORA LUTEA IN SINGLE AND MULTIPLE OVULATING EWES ON TWO FEEDING REGIMES J. J. DUFOURTand P. MATTON'z lresearch Station, Agriculture Canada, Lennoxville, Quebec JtM 123 and2department Biotogy, Sherbrooke University, Sherbrooke, Que. JIK2RI. Received24 Mar. 1977, acceptetl 27 July DuFoun, J. J. eno MrrroN, P Identification ovarian s at estrus and development their ensuing corpora lutea in single and multiple ovulating ewes on two feeding regimes. Can.J. Anim. Sci. 57: 64j-652. Twelve hours after standing estrus was first detected, 30 ewes had their four largest s identified and marked with India ink. Seven days later, ovulation rates and origin the corpora lutea (CL) from previously marked fotlicles were determined. Feeding a high energy ration from day l0 to estrus did not change the ovulation rate as compared to feeding a low energy ration. Its only effect was to increase the diameter the third and fourth largest s. The diameter the largest was identical in single and multiple ovulators. However, in multiple ovulators, the diameter the second largest was larger than in single ovulators. The largest identified at estrus developed into a CL that was l5%o heavier in singte than in multiple ovulators. In multiple ovulators, the second largest developed into a CL weight similar to that from the largest. on a identifi6 et marqu6 i I'encre de Chine, les 'quatre plus gros s de 30 brebis, 12 h aprbs le d6but de I'oestrus. Septjours plus tard on a abattu les brebis et d6termin6 I'origine et le taux d'ovulation. L'imposition d'un r6gime h haute teneur 6nerg6tique pendant une p6riode de 6 jours, h partir du l0ibme jour du cycle jusqu'au d6but de I'oestrus n'a pas chang6 le taux d'ovulation. Son seul effet a 6t6 d'accroitre le diambtre des 3ibme et 4idme plus gros follicules pr6sents au temps du marquage. Aprds avoir class6 les brebis selon le taux d'ovulation observ6 aprbs 1e marquage, nous avons constat6 que les brebis i ovulation multiple avaient, au temps du marquage, un deuxibme plus gros follicule plus grand que les brebis ir ovulation simple. Le plus grand follicule identifi6 au temps de l'oestrus 6tait de mome grandeur chez toutes les brebis mais chez les brebis ir ovulation simple i1 se d6veloppait en des corps jaunes qui 6taient de 157o plus lourds que ceux des brebis ir ovulation multiple. Chez les brebis h ovulation multiple, il y avait une diff6rence de I. 8 mm entre le diambtre des deux plus gros follicules. I1s ont produit cependant des corps j aunes de poids indentiques. In the single ovulating cow and ewe, the The purpose the present experiment largest identified 3 days prior to was to determine the diameter ovarian estrus is the one destined to ovulate (Dufour s present at estrus in sheep that etal. 1972; Bh6rer etal. 1976).In multiple would ovulate one or more s. Some ovulators, however, it is not possible to ewes received additional energy in the week predict the origin the two s preceding estrus in an atternpl to produce ovulated solely on the basis their size. differentovulationrates. Bh6rer et al. (1976) in sheep marked the two largest s one or more days prior MATERTALS AND METHODS to estrus and showed that while the largest Thirty DLS ewes (fz Dorser, l/a Leicester, and ovulated, the second ovulation 1/a Suffott; were used in this study. All had occurred mostly from an unidentified. lambed twice before in 2 consecutive years. Can. J. Anim. Sci. s7:647-6s2(dec. r9z7) During 2 mo starting on 5 Aug. 1976, the ewes 647

2 648 CANADIAN JOURh\AL OF ANINlAL SCIENCE were fed a medium quality hay ad libitum. The experimental period began on l-5 Oct., when the ewes were checked daily for estrus. On day l0 an estrous cycle, the ewes were divided at random into two groups. The first group u'as fed a lorv energy ration a medium quality hay ad libitum. The feeding the second group was supplemented with 1.0 kg a grain mixture. Following distribution to the two feeding regimes, the ewes were checked for estrus twice daily at l2-h intervats. They were laparotomized l2 h after standing heat was first detected, while the ewes were under general anesthesia (pentobarbitone sodium). The diameter the four largest s was determined using a Vernier caliper, and marked. Marking u'as done by injecting "dots" lndia ink with a hypodelmic syringe around the periphery the s just beneath the ovarian tunic. Location and diameter the four largest marked s were recorded. After surgery all ewes were fed medium quality hay ad libitum until autopsied. Duling autopsy, performed 7 days after laparotomy, the reproductive organs were removed and the ovaries examined. A marked was considered to have ovulated if the CL was completely outlined by dots India ink. The origin the CL was noted and each luteal structure weighed. Diameters marked s still present were also recorded. Data were analyzed by analysis variance. RESULTS Ovarian Follicles at Estrus Among the four largest s measured at estrus, the sizes the third and the fourth largest s were significantly influenced by the levels energy intake (Table 1). They averaged, respectively,0.t and 0.4 mm larger in diameter (P < 0.05) in ewes Levels energy -- High Low fed the high energy, as compared to those fed the low energy ration. The average diameters the largest and the second largest were similar in size for the ewes fed the two levels energy. All 30 ewes had ovulated at least one when autopsied 7 days after identification the four largest s present at estrus. Ten ewes, five on each energy ration, ovulated one marked. Among the 20 remaining ewes, 9 on the high and 10 on the low energy rations ovulated two s. Only one ewe on the high energy ration ovulated three s. To determine the size ovarian s present at estrus in ewes which ovulated one or more than one marked, the ewes were classified as single or multiple ovulators and the diameters the two largest marked s determined accordingly. In multiple ovulators, the size the second largest averaged 5.4 mm, 1.5 mm larger in diameter (P < 0.001) than in single ovulators (Table 2). The minimum size the second largest recorded at estrus that ovulated was 3.8 mm in twin ovulators. The difference in size the largest for the two groups ewes was not statistically significant (P > 0.05). The minimum size the largest that ovulated was 5.0 and 5.5 mm in single and twin ovulators, respectively. Development CorPora Lutea The development CL from s identified at estrus was observed 7 days later and determined according to the ovulation rates. Since the feeding regimes, Table 1. Effects level energy in the rations ewes on the follicular development observed at estrus Number ewes l5 t) Largest Diameter s (mm) Second largest '7.2+.Oi a 4.8!1.3 a a 4.9+ l.l a Third largest Fourth largest a 3.3+O.'/ a b 2.91:0.3 b imean t standard deviation. a,b: Means in vertical columns followed by different letters are significantly different atp < 0.05

3 DUFOUR AND MATTON-OVARIAN FOLLICLES AT ESTRUS 649 Table 2. Characteristics the two largest s present at cstrus in ewes with single or multiple ovulations and development their ensuing corpora lutea (CL) Ovulation rates 1 CL (10 ewes) 2 CL (19 ewes)t Items Average diameter al estrus (mm) Average weight CL originating from marked s { mg)$ Largest a nd largest 3.9i0.8 -t Largest a 488+lll 2nd largest y fdata from one ewe with three ovulations were not included *Mean + standard deviation. $All differences were not significant..z Differencebetweensingleandmultipleovulatorsintheirlargestwasnotsignificant. x-y Differences between single and multiple ovulators in their second largest was significant atp < alone or in combination with the ovulation rates did not affect the weight the CL, it was ignored in the analysis. In single ovulators, the largest present at estrus developed into CL averaging 512 mg, 75Vo heavier than CL developing from the largest present in multiple ovulators (0.10 > P > 0.05, Table 2). In multiple ovulators, the largest two s developed into CL averaging 488 mg and 461 mg in that order. Fate the "Non-ovulating" Marked Follicles Eighteen (627o) the ewes had at least one marked present on the ovary I wk following ovulation (Table 3).In 1 these l8 ewes the marked s had increased Ovulation rates in size, while in the remaining ll it had decreased. The increase or decrease was generally small, yet in some ewes the increase was as high as 6.2 mm and the decrease as high as 2.4 mm. DISCUSSION No stimulatory effect the feeding regime was observed on the ovulation rate. It is known in pigs that the stimulatory effect the feeding regime is mediated by a stimulation the follicular development, since high energy regime increases the number s ovulatory size at estrus (Dailey et al. 1972). In the present experiment, only the third and fourth largest s appeared to be stimulated by the high energy ration. It is then possible that Table 3. Fate marked non-ovulated s in ewes with single or multiple ovulations No. No. ewes ewes Number marked s still present in a ewe at autopsy Change in diameter (mm) Change in diameter (mm) No. No. ewes Avg Range ewes Avg Range One marked ovulated Two marked s ovulated l0 +O to 1.1 l to to to 1.9

4 650 CANADIAN JOURNAL OF ANIMAL SCIENCE the absence the expected increase in ovulation rate could result from the failure the high energy ration to stimulate the development the second largest, if one assumes that the effect the feeding reigme is similar in the pig and the sheep. It is not known, however, whether or not the length the high energy feeding period was optimal in bringing a positive follicular development, but results obtained in pigs have indicated that a 6-day period is sufficient to bring about a stimulation follicular development (Dailey et al 1972). The effect the high energy level on ovulation rates and presumably on follicular development would appear to be influenced by the time at which the treatment is imposed during the breeding season. Dufour and Wolynetz (1971) observed a significant increase in the proportion ewes with multiple ovulation only when the effect feeding was registered at the third and fourth estrus the breeding season. At the first and second estrus the beginning the breeding season, they could not find an effect feeding a high energy ration. Likewise, Hulet et al. (1968) could not modify the ovulation rate by changing the level nutrition during the peak the breeding season. It would therefore appear that the sensitivity the ovary and/or the strength the ovulating stimulus go through various phases, being refractory during the early part and the peak the breeding season. The only difference between these two phases would be that during the early part the breeding season, the ovulation rate remains low, while during the peak the breeding season, it is high. All ovulations observed in the ewes studied originated from marked s. By estrus, it became possible to predict the origin any number ovulations in the ewe on the basis follicular size. In twin ovulators, in addition to the first ovulations originating from the largest s, all second ovulations came from the second largest. Bh6rer et al. (1976) were not able to predict the origin the two ovulated s when they were identified one or more days prior to estrus. The reason for their inability to predict the origin the second ovulation was probably that, when measured, the second largest was in a state atresia and by the time estrus another had grown to the stage the second largest. In single or multiple ovulators, the diameter the largest was not significantly different in size when measured at estrus. However, the other large s, and especially the second largest, were significantly larger in multiple ovulators. Since in cases double ovulations the second ovulation always came from the identified at estrus as the second largest, it appears that the size the second largest at estrus is very important in determining the rate ovulation. The mechanism by which double ovulations occur in sheep appears to be an increase in the number large preovulatory s present at estrus. This was demonstrated following PMSG injection (Ellington et al. 1970; Hulet et al. 1969; Shelton and Moore 1967). Because Thimonier and Pelletier (l9ll') could not detect a difference in the magnitude LH surge by single and multiple ovulators at estrus, the level LH may not be responsible for the rupture an increased number s in multiple ovulators. The present results on the fate marked non-ovulated s are consistent with the concept that s are in a state continuous growth and atresia. These results extend the work Smeaton and Robertson (1971) who observed that s marked twice at 7-day intervals had regressed in all seven treated ewes. In the present study, all marked s had regressed in only 38Vo treated ewes. For the other ewes, at least one was still present within 7 days. The difference between the two studies could be due to the types s studied and/or the

5 DUFOUR AND MATTON-OVARIAN FOLLICLES AT ESTRUS 651 techniques used. Smeaton and Robertson (1971) followed up only the largest using the technique puncturing each for injection carbon. In the present study, only the ovarian stroma surrounding each was pricked and marked with India ink. The destiny the four largest s was then followed up. Puncturing ovarian s directly may have damaged the integrity the foitlctes. Indeed Hunter and Baker (1915) using this technique interfered with ovulation in pigs. Smeaton and Robertson (1971) could only predict the ovulating when marking was done at or just before estrus. At that time the ovulating had probably already received its signal and puncture the would not interfere with ovulation. Using the present technique, s destined to ovulate have been determined as long as 3 days prior to estrus (Dufour et al. 1972; Bh6rer et al ). The results observed on the development CL showed that there was no direct relationship between the diameter the s ovulated and the weight the CL formed from them. In multiple ovulators the CL originating from the largest and the second largest were similar in weight in spite the fact that the diameter the largest was 1.8 mm larger than that the second largest. To explain the difference observed between the weight the CL originating from the largest s in single and multiple ovulators, it may be suggested that the growth immediately preceding ovulation is more rapid in single ovulators than in multiple ovulators. In multiple ovulators, however, this hypothesis cannot explain the recovery in size the second largest prior to ovulation, if the two largest s were ovulated at the same time. Another probable explanation is that the size the preovulatory had no effect on the weight the CL, but rather that the development the CL was influenced during the days following ovulation by the amount available gonadotropins. Kaltenbach et al. (1968) demonstrated the need a hypophysial luteotrophic support for CL formation and maintenance in hypophysectomized ewes. Thus the hypothesis would imply that the LH secretion was similar in amount in multiple and single ovulators and the two CL present in multiple ovulators would receive an equal amount LH and attain the same development. In contrast, for single ovulators, all the LH is directed to the development the only one CL leading to a heavier structure. ACKNOWLEDGMENTS The authors wish to thank A. Bouchard and Y. Vilandr6 for technical assistance during surgery and processing the reproductive organs, and D. Pitmann and M. Perreault for animal care and data collection. BHERER, J., DUFOUR, J. and MATTON, P Destin6e des deux plus gros follicules des ovaires de brebis d la suite de la destruction du plus gros follicule et/ou de I'enlbvement du corps jaune ) deux moments du cycle. Can. J. Physiol. Pharmacol. 54: 7 - ll. DAILEY, R. A., CLARK, J. R., FIRST, N. L., CHAPMAN, A. B. and CASIDA, L. E Effects high and low feeding at two stages the estrous cycle on follicular development in gilts from four genetics groups. J. Anim. Sci. 35: l21o DUFOUR, J., WHITMORE, H. L., GINTHER, O.J. and CASIDA, L. E. l9t2.identification the ovulating by its size on different days the estrous cycle in heifers. J. Anim. Sci. 34: DUFOUR, J. J. and WOLYNETZ, M Effects energy levels imposed before or during the estrous season on rates and locations ovulation in sheep. Can. J. Anim. Sci. 57: r69-t7 6. ELLINGTON, E. F., KNIGHT, A. D. and FOX, D. W Reproductive performance ewes in an early weaning controlled-breeding program. J. Anim. Sci.3l: HULET, C. V., PRICE, D. A. and FOOTE, W. C Effects variation in light, month year and nutrient intake on reproductive phenomena in ewes during the breeding season. J. Anim. Sci. 27:

6 652 canadian JoURNAL OF ANIMAL SCIENCE HULET, C. V., FOOTE, W. C. and PRICE, D. A Ovulation rate and subsequent lamb production in the nulliparous and prinriparous ewe. J. Anim. Sci.28: HUNTER, R. H. F. and BAKER, T. G Development and fate porcine Graafian s identified at different stages the estrouscycle. J. Reprod. Fertil.43: KALTENBACH, C. C., GRAPER, J. W., NISEWENDER, G. D. and NALBANDOV, A. V Luteotrophic properties some pituitary hormones in non-pregnant hypophysectomized ewes. Endocrinolosv 82: 8 I SHELTON, J. N. and MOORE, N. W Response the ewe to pregnant mare serum and to horse anterior pituitary extract. J. Reprod. Fertil. 14: 175-1'7'7. SMEATON, T. C. and ROBERTSON, H. A Studies on the growth and atresia Graafian s in the ovary the sheep. J. Reprod. Fertil. 25: THIMONIER, J. and PELLETIER, J Diff6rence g6n6tique dans la d6charge ovulante (LH) chez des brebis de race Ile-de-France; relations avec le nombre d'ovulations. Ann. Biol. Anim. Biochim. Biophvs. ll:

Acutely Restricting Nutrition Causes Anovulation and Alters Endocrine Function in Beef Heifers

Acutely Restricting Nutrition Causes Anovulation and Alters Endocrine Function in Beef Heifers Acutely Restricting Nutrition Causes Anovulation and Alters Endocrine Function in Beef Heifers F.J. White, L.N. Floyd, C.A. Lents, N.H. Ciccioli, L.J. Spicer, and R.P. Wettemann Story in Brief The effects

More information

The Relation between Patterns of Ovarian Follicle Growth and Ovulation Rate in Sheep

The Relation between Patterns of Ovarian Follicle Growth and Ovulation Rate in Sheep Aust. J. Bioi. Sci., 1978, 31, 649-55 The Relation between Patterns of Ovarian Follicle Growth and Ovulation Rate in Sheep K. E. Turnbull, P. E. Mattner, J. M. George and R. J. Scaramuzzi Division of Animal

More information

Oestradiol levels in sheep plasma during the oestrous cycle

Oestradiol levels in sheep plasma during the oestrous cycle Oestradiol levels in sheep plasma during the oestrous cycle R. J. Scaramuzzi and R. B. Land M.R.C. Unit of Reproductive Biology, University of Edinburgh, 39 Chalmers Steet, Edinburgh, EH3 9ER, and A.R.C.

More information

Use of a synthetic progestogen in combination with a superovulatory. treatment for induction of synchronized estrus in seasonally anovular ewes.

Use of a synthetic progestogen in combination with a superovulatory. treatment for induction of synchronized estrus in seasonally anovular ewes. Introduction Ewes & Progestogen - 1998 Sheep Day Report Use of a synthetic progestogen in combination with a superovulatory treatment for induction of synchronized estrus in seasonally anovular ewes. D.A.

More information

ANESTRUS BUFFALO TREATMENT SUCCESS RATE USING GNRH

ANESTRUS BUFFALO TREATMENT SUCCESS RATE USING GNRH : 4545-4550 ISSN: 2277 4998 ANESTRUS BUFFALO TREATMENT SUCCESS RATE USING GNRH YAGHOUBAZIZIYAN, FARDGHRAKHANLU 1 AND SAMAD MOSAFERI 2* 1: Department of Veterinary Medicine, Tabriz Branch, Islamic Azad

More information

Luteolysis and Pregnancy Outcomes in Dairy Cows after Treatment with Estrumate or Lutalyse

Luteolysis and Pregnancy Outcomes in Dairy Cows after Treatment with Estrumate or Lutalyse Luteolysis and Pregnancy Outcomes in Dairy Cows after Treatment with Estrumate or Lutalyse J. S. Stevenson and A. P. Phatak Summary In Experiment, lactating dairy cows (n =,230) in 6 herds were treated

More information

PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS

PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS M.F. Smith, G.A. Perry, J.A. Atkins, M.E. Risley, D.C. Busch, and D.J. Patterson Division of Animal Sciences, University of Missouri, Columbia

More information

Overview PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS

Overview PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS PHYSILGICAL PRINCIPLES UNDERLYING SYNCHRNIZATIN F ESTRUS M.F. Smith, G.A. Perry, J.A. Atkins, E.M. Jinks, K.G. Pohler, and D.J. Patterson Division of Animal Sciences, University of Missouri, Columbia Department

More information

The estrous cycle. lecture 3. Dr. Wafer M. Salih Dr. Sadeq J. Zalzala Dr. Haydar A. AL-mutar Dr. Ahmed M. Zakri

The estrous cycle. lecture 3. Dr. Wafer M. Salih Dr. Sadeq J. Zalzala Dr. Haydar A. AL-mutar Dr. Ahmed M. Zakri The estrous cycle lecture 3 By Dr. Wafer M. Salih Dr. Sadeq J. Zalzala Dr. Haydar A. AL-mutar Dr. Ahmed M. Zakri The estrous cycle Definition Sexual Puberty in the females is defined as the age at the

More information

in LH concentration between sinsle

in LH concentration between sinsle PREPUBERTAL PLASMA LH CONCENTRATION, OVULATION RATE AND PROLIFICACY IN FINN, SUFFOLK AND FINN-SUFFOLK EWES J. CHIQUETTE', F. MINVIELLE', and J. J. DUFOUR, td partement de Zootechnie, FSAA, Universitt Laval,

More information

Overview. Mike Smith presentation Oct. 8, 2014 ARSBC PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS

Overview. Mike Smith presentation Oct. 8, 2014 ARSBC PHYSIOLOGICAL PRINCIPLES UNDERLYING SYNCHRONIZATION OF ESTRUS Mike Smith presentation ct., 1 PHYSILGICAL PRINCIPLES UNDERLYING SYNCHRNIZATIN F ESTRUS M.F. Smith, G.A. Perry, J.A. Atkins, K.G. Pohler, R.M. Wallace, S.E. Dickinson, A.. Gatea and D.J. Patterson Division

More information

Superovulation and egg transfer in the ewe

Superovulation and egg transfer in the ewe Superovulation and egg transfer in the ewe Suzanne TORRÈS Y. COGNIÉ Station de Physiologie animale, 1. N. R. A., 78350 Jouy-en-Josas, France. (!&dquo;) Laboratoire de Recherche sur la Fertilité femelle,

More information

ESTROUS SYNCHRONIZATION AND THE CONTROL OF OVULATION. PCattle PSmall ruminants PPigs

ESTROUS SYNCHRONIZATION AND THE CONTROL OF OVULATION. PCattle PSmall ruminants PPigs ESTROUS SYNCHRONIZATION AND THE CONTROL OF OVULATION PCattle PSmall ruminants PPigs BASICS P Prostaglandins P Progesterone and progestogens P Gonadotropin-releasing hormone (GnRH) PEstrogens (off-label

More information

Influence of Experimentally- induced clinical mastitis on Reproductive Performance of Dairy Cattle

Influence of Experimentally- induced clinical mastitis on Reproductive Performance of Dairy Cattle Influence of Experimentally- induced clinical mastitis on Reproductive Performance of Dairy Cattle Dr. Mitch Hockett Department of Animal Science North Carolina State University Characteristics of Mastitis

More information

The influence of season of lambing and lactation on reproductive activity and plasma LH concentrations in. Merino ewes. B. J. Restall and B. G.

The influence of season of lambing and lactation on reproductive activity and plasma LH concentrations in. Merino ewes. B. J. Restall and B. G. The influence of season of lambing and lactation on reproductive activity and plasma LH concentrations in Merino ewes B. J. Restall and B. G. Starr N.S. W. Department of Agriculture, P.O. Box 239, Blacktown,

More information

Variation in Duration of Estrus. Dr. Michael Smith, Un. of Missouri August 17, Overview. Ovarian Structures Graffian follicle.

Variation in Duration of Estrus. Dr. Michael Smith, Un. of Missouri August 17, Overview. Ovarian Structures Graffian follicle. Dr. Michael Smith, Un. of Missouri August 17, 15 Overview Establishment of Pregnancy in Beef Cattle: Application of Basic Principles M.F. Smith 1, G.A. Perry, K.G. Pohler 1, S.E. Dickinson 1, and D.J.

More information

Understanding Postpartum Anestrus and Puberty

Understanding Postpartum Anestrus and Puberty Understanding Postpartum Anestrus and Puberty Dr. Jack C. Whittier, Colorado State University Dr. Jim Berardinelli, Montana State University Dr. Les Anderson, University of Kentucky 2008 Robert E. Taylor

More information

Comparison of long-term controlled internal drug release-based protocols to synchronize estrus and ovulation in postpartum beef cows 1

Comparison of long-term controlled internal drug release-based protocols to synchronize estrus and ovulation in postpartum beef cows 1 Published November 25, 2014 Comparison of long-term controlled internal drug release-based protocols to synchronize estrus and ovulation in postpartum beef cows 1 J. M. Nash,* D. A. Mallory,* M. R. Ellersieck,

More information

Considerations Related to Heifer Management. Heifer Management CONTROL OF ESTRUS IN HEIFERS

Considerations Related to Heifer Management. Heifer Management CONTROL OF ESTRUS IN HEIFERS Considerations Related to Heifer Management CONTROL OF ESTRUS IN HEIFERS DJ Patterson, NT Martin, JM Thomas, and MF Smith Division of Animal Sciences University of Missouri Heifer Management Effect of

More information

different ovulation rates

different ovulation rates Plasma progesterone levels throughout the oestrous cycle and release of LH at oestrus in sheep with different ovulation rates J. F. Quirke, J. P. Hanrahan and J. P. Gosling The Agricultural Institute,

More information

SYNCHRONIZATION OF OESTRUS AND OVULATION IN BEEF HEIFERS

SYNCHRONIZATION OF OESTRUS AND OVULATION IN BEEF HEIFERS SYNCHRONIZATION O OESTRUS AND OVULATION IN BEE HEIERS B Y D. R. LAMOND* Summary orty Shorthorn heifers were removed from pasture, trucked 100 miles, a n d placed in yards. They were fed a ration containing

More information

Reproductive organ morphology and carcass traits in unselected naturally mating female Bronze turkeys at onset of lay

Reproductive organ morphology and carcass traits in unselected naturally mating female Bronze turkeys at onset of lay Reproductive organ morphology and carcass traits in unselected naturally mating female Bronze turkeys at onset of lay R. A. Renema 1, V. L. Melnychuk 1, F. E. Robinson 1,3, H. L. Classen 2, and R. D. Crawford

More information

particularly so in the case of the role of gonadotrophin secretion in the mediation

particularly so in the case of the role of gonadotrophin secretion in the mediation -... SEASONAL VARIATION IN THE OESTROGEN INDUCED LH DISCHARGE OF OVARIECTOMIZED FINNISH LANDRACE AND SCOTTISH BLACKFACE EWES R. B. LAND, A. G. WHEELER W. R. CARR ARC Animal Breeding Research Organisation,

More information

Controlled Breeding Programs for Heifers

Controlled Breeding Programs for Heifers Controlled Breeding Programs for Heifers Kira Macmillan and Marcos G. Colazo Livestock Research Section, Alberta Agriculture and Forestry, Edmonton, Alberta, Canada. Introduction E-mail: marcos.colazo@gov.ab.ca

More information

North Florida Research and Education Center, University of Florida, Marianna, FL 2

North Florida Research and Education Center, University of Florida, Marianna, FL 2 Administration of Recombinant Bovine Somatotropin Prior to Fixed-time Artificial Insemination and the Effects on Pregnancy Rates and Embryo Development in Beef Heifers N. Oosthuizen 1, P. L. P. Fontes

More information

Estrous Synchronization Systems for Beef Heifers. Bob L. Larson, DVM, PhD, ACT

Estrous Synchronization Systems for Beef Heifers. Bob L. Larson, DVM, PhD, ACT Estrous Synchronization Systems for Beef Heifers Bob L. Larson, DVM, PhD, ACT Synchronization Systems Progestogens Act to suppress estrus and ovulation First products used to attempt control of the estrous

More information

How Does Photostimulation Age Alter the Interaction Between Body Size and a Bonus Feeding Program During Sexual Maturation?

How Does Photostimulation Age Alter the Interaction Between Body Size and a Bonus Feeding Program During Sexual Maturation? 16 How Does Photostimulation Age Alter the Interaction Between Body Size and a Bonus Feeding Program During Sexual Maturation? R A Renema*, F E Robinson*, and J A Proudman** *Alberta Poultry Research Centre,

More information

CHANGES IN SERUM LEVELS OF LH AND FSH IN PROGESTERONE.TREATED OVARIECTOMIZED EWES FOLLOWING A SINGLE INJECTION OF ESTROGEN

CHANGES IN SERUM LEVELS OF LH AND FSH IN PROGESTERONE.TREATED OVARIECTOMIZED EWES FOLLOWING A SINGLE INJECTION OF ESTROGEN CHANGES N SERUM LEVELS OF LH AND FSH N PROGESTERONE.TREATED OVARECTOMZED EWES FOLLOWNG A SNGLE NJECTON OF ESTROGEN B. E. HOWLAND, W. M. PALMER'?, andl. M. SANFORD' Departments of roral Biology and zanimal

More information

TREATMENT OF ANOESTRUS IN DAIRY CATTLE R. W. HEWETSON*

TREATMENT OF ANOESTRUS IN DAIRY CATTLE R. W. HEWETSON* TREATMENT OF ANOESTRUS IN DAIRY CATTLE R. W. HEWETSON* Summary Six priming doses of 40 mg progesterone at two day intervals followed by 1,000 I.U. P.M.S. were superior to two priming doses plus P.M.S.

More information

Polymorphism of egg white proteins

Polymorphism of egg white proteins Polymorphism of egg white proteins egg weight and components weight in the Fayoumi hen A. OBEIDAH, P. MÉRAT L. DURAND Laboratoire de Gin gtique factorielle (*) Centre national de Recherches zootechniques,

More information

OVULATION RATE AND LITTER SIZE OF BARBADOS, TARGHEE AND CROSSBRED EWES'

OVULATION RATE AND LITTER SIZE OF BARBADOS, TARGHEE AND CROSSBRED EWES' OVULATION RATE AND LITTER SIZE OF BARBADOS, TARGHEE AND CROSSBRED EWES' G. E. Bradford and J. F. Quirke 2 University of California 3, Davis 95616 ABSTRACT Ovulation rate was measured in Barbados Blackbelly

More information

Follicular dynamics and dominance in Booroola \m=x\finnish Landrace and Booroola \m=x\suffolk ewes heterozygous for the F gene

Follicular dynamics and dominance in Booroola \m=x\finnish Landrace and Booroola \m=x\suffolk ewes heterozygous for the F gene Follicular dynamics and dominance in Booroola \m=x\finnish Landrace and Booroola \m=x\suffolk ewes heterozygous for the F gene F. Castonguay, J. J. Dufour, F. Minvielle and R. Estrada Département de zootechnie,

More information

Failure of Gonadotropin Therapy to Induce Estrus in Gilts Treated with a GnRH Analog to Suppress Ovarian Activity

Failure of Gonadotropin Therapy to Induce Estrus in Gilts Treated with a GnRH Analog to Suppress Ovarian Activity Failure of Gonadotropin Therapy to Induce Estrus in Gilts Treated with a GnRH Analog to Suppress Ovarian Activity Antonio Garcia, DVM, PhD (deceased) a Mark J. Estienne, PhD b Allen F. Harper, PhD b James

More information

SHEEP. nd if appropriate/applicable)

SHEEP. nd if appropriate/applicable) SHEEP GENERAL: UREA WARNING (only where an nd if appropriate/applicable) Vinegar is an effective remedy against NPN poisoning. Mix with an equal amount of water. Dose half a bottle per calf or large sheep

More information

Follicular and ovulatory responses of the right versus left ovaries to ecg treatment in Shall Iranian ewes

Follicular and ovulatory responses of the right versus left ovaries to ecg treatment in Shall Iranian ewes African Journal of Biotechnology Vol. 9(10), pp. 1523-1527, 8 March, 2010 Available online at http://www.academicjournals.org/ajb ISSN 1684 5315 2010 Academic Journals Full Length Research Paper Follicular

More information

Effects of Day of Cycle at Initiation of a Select Synch/CIDR + Timed-artificial Insemination Protocol in Suckled Angus and Brangus Cows

Effects of Day of Cycle at Initiation of a Select Synch/CIDR + Timed-artificial Insemination Protocol in Suckled Angus and Brangus Cows Effects of Day of Cycle at Initiation of a Select Synch/CIDR + Timed-artificial Insemination Protocol in Suckled Angus and Brangus Cows Regina Esterman 1 Brad Austin Steaven Woodall Erin McKinniss Joel

More information

Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer

Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer Effects of progesterone, oestradiol benzoate and cloprostenol on luteal function in the heifer R. K. Munro and N. W. Moore Department of Animal Husbandry, University of Sydney, Camden, New South Wales

More information

Department of Animal and Poultry Sciences August 2, 1999

Department of Animal and Poultry Sciences August 2, 1999 Department of Animal and Poultry Sciences August 2, 1999 Erratic Oviposition and Defective Egg Syndrome (EODES) Effects of Genetic Selection for Body Weight Héctor L. Santiago ABSTRACT Reproductive performance

More information

Uterine contraction patterns and fertility in early postpartum ewes

Uterine contraction patterns and fertility in early postpartum ewes Small Ruminant Research 38 (2000) 51±56 Uterine contraction patterns and fertility in early postpartum ewes D.O. Kiesling *, M.A. Akinbami 1, S. Meredith, J.E. Warren Jr 2 307 Foster Hall, Lincoln University,

More information

THE EXPERIMENTAL MODIFICATION OF THE OESTROUS CYCLE IN THE FERRET BY DIFFER- ENT INTENSITIES OF LIGHT IRRADIATION AND OTHER METHODS

THE EXPERIMENTAL MODIFICATION OF THE OESTROUS CYCLE IN THE FERRET BY DIFFER- ENT INTENSITIES OF LIGHT IRRADIATION AND OTHER METHODS THE EXPERIMENTAL MODIFICATION OF THE OESTROUS CYCLE IN THE FERRET BY DIFFER- ENT INTENSITIES OF LIGHT IRRADIATION AND OTHER METHODS BY F. H. A. MARSHALL School of Agriculture, Cambridge {Received 12 December

More information

TRANSPORT OF SPERMATOZOA AND APPARENT FERTILIZATION RATE IN YOUNG AND MATURE MERINO EWES

TRANSPORT OF SPERMATOZOA AND APPARENT FERTILIZATION RATE IN YOUNG AND MATURE MERINO EWES Proc. Aust. Soc. Anim. Prod. (1972) 9: 176 TRANSPORT OF SPERMATOZOA AND APPARENT FERTILIZATION RATE IN YOUNG AND MATURE MERINO EWES T. G. KENNEDY* and J. P. KENNEDY* Summary Transport of spermatozoa and

More information

Purebred Cattle Series Synchronization of Estrus in Cattle

Purebred Cattle Series Synchronization of Estrus in Cattle Agriculture and Natural Resources FSA3120 Purebred Cattle Series Synchronization of Estrus in Cattle Tom R. Troxel Professor and Associate Department Head Animal Science Arkansas Is Our Campus Visit our

More information

TOTAL MIXED RATIONS FOR FEEDING DAIRY HEIFERS FROM 3 TO 6 MONTHS OF AGE. H. Terui, J. L. Morrill, and J. J. Higgins 1

TOTAL MIXED RATIONS FOR FEEDING DAIRY HEIFERS FROM 3 TO 6 MONTHS OF AGE. H. Terui, J. L. Morrill, and J. J. Higgins 1 TOTAL MIXED RATIONS FOR FEEDING DAIRY HEIFERS FROM 3 TO 6 MONTHS OF AGE H. Terui, J. L. Morrill, and J. J. Higgins 1 Summary Total mixed rations (TMR) with different forage (F):concentrate (C) ratios were

More information

C.A. Peterson, R.N. Summers, F.A. Ireland, T.F. Lock, D.B. Faulkner, and D.J. Kesler SUMMARY

C.A. Peterson, R.N. Summers, F.A. Ireland, T.F. Lock, D.B. Faulkner, and D.J. Kesler SUMMARY ESTRUS SYNCHRONIZATION AND PREGNANCY RATES OF BEEF COWS ADMINISTERED MELENGESTEROL ACETATE THE TEN DAYS BEFORE ESTRUS SYNCHRONIZATION WITH SYNCRO-MATE B C.A. Peterson, R.N. Summers, F.A. Ireland, T.F.

More information

Comparison of the Efficiency and Accuracy of Three Estrous Detection Methods to Indicate Ovulation in Beef Cattle 1

Comparison of the Efficiency and Accuracy of Three Estrous Detection Methods to Indicate Ovulation in Beef Cattle 1 Comparison of the Efficiency and Accuracy of Three Estrous Detection Methods to Indicate Ovulation in Beef Cattle 1 George A. Perry 2 Department of Animal and Range Sciences BEEF 2005-24 12 Summary The

More information

HIGH DENSITY DIETS FOR DWARF LAYERS (1)

HIGH DENSITY DIETS FOR DWARF LAYERS (1) HIGH DENSITY DIETS FOR DWARF LAYERS (1) J. H. QUISENBERRY Texas A and M University, Department of Poultry Science College Station, Texas U. S. A. 77843 SUMMARY The recent widespread introduction of a simply

More information

1 of 9 7/1/10 2:08 PM

1 of 9 7/1/10 2:08 PM LIFETIME LAMB AND WOOL PRODUCTION OF TARGHEE OR FINN-DORSET- TARGHEE EWES MANAGED AS A FARM OR RANGE FLOCK N. Y. Iman and A. L. Slyter Department of Animal and Range Sciences SHEEP 95-4 Summary Lifetime

More information

Beef Cattle Handbook

Beef Cattle Handbook Beef Cattle Handbook BCH-2320 Product of Extension Beef Cattle Resource Committee Estrous Synchronization for Beef Cattle Gene H. Deutscher, Extension Beef Specialist, University of Nebraska This Fact

More information

Studies of pituitary function in lactating ewes

Studies of pituitary function in lactating ewes Studies of pituitary function in lactating ewes B. J. Restall, R. D. Kearins and B. G. Starr New South Wales Department ofagriculture, P.O. Box 239, Blacktown, New South Wales, and*new South Wales Department

More information

Anestrus and Estrous Detection Aids

Anestrus and Estrous Detection Aids Anestrus and Estrous Detection Aids IRM-7 Dairy Integrated Reproductive Management Dr. M.A. Varner University of Maryland The accurate and efficient detection of estrus (heat) in dairy cattle is an important

More information

Early lambing with: Improved fertility Improved fecundity Improved prolificacy Compact lambing period Normal return to season Normal sexual cycle

Early lambing with: Improved fertility Improved fecundity Improved prolificacy Compact lambing period Normal return to season Normal sexual cycle Early lambing with: Improved fertility Improved fecundity Improved prolificacy Compact lambing period Normal return to season Normal sexual cycle Presentation: Regulin is a yellow cylindrical implant containing

More information

Lower body weight Lower fertility Lower fleece weight (superfine) (fine)

Lower body weight Lower fertility Lower fleece weight (superfine) (fine) Generally, finer wool merino sheep are best suited to cooler areas Major Sheep Breeds In Australia Merino (75%) Border Leicester Merino x Border Leicester (12%) Suffolk Cheviot Poll Dorset Romney Merino

More information

Evaluation of Reproduction and Blood Metabolites in Beef Heifers Fed Dried Distillers Grains Plus Solubles and Soybean Hulls During Late Gestation 1

Evaluation of Reproduction and Blood Metabolites in Beef Heifers Fed Dried Distillers Grains Plus Solubles and Soybean Hulls During Late Gestation 1 Evaluation of Reproduction and Blood Metabolites in Beef Heifers Fed Dried Distillers Grains Plus Solubles and Soybean Hulls During Late Gestation 1 Chanda L. Engel 2, H. H. Trey Patterson 3, Ron Haigh

More information

RELATIONSHIPS AMONG WEIGHTS AND CALVING PERFORMANCE OF HEIFERS IN A HERD OF UNSELECTED CATTLE

RELATIONSHIPS AMONG WEIGHTS AND CALVING PERFORMANCE OF HEIFERS IN A HERD OF UNSELECTED CATTLE RELATIONSHIPS AMONG WEIGHTS AND CALVING PERFORMANCE OF HEIFERS IN A HERD OF UNSELECTED CATTLE T. C. NELSEN, R. E. SHORT, J. J. URICK and W. L. REYNOLDS1, USA SUMMARY Two important traits of a productive

More information

Songklanakarin J. Sci. Technol. 40 (4), , Jul. Aug Original Article

Songklanakarin J. Sci. Technol. 40 (4), , Jul. Aug Original Article Songklanakarin J. Sci. Technol. 40 (4), 904-908, Jul. Aug. 2018 Original Article Effect of controlled internal drug release device and progesterone sponge on short-term estrus synchronization in Zandi

More information

Internal Assessment Resource NCEA Level 1 Science AS KEEP CALM AND COUNT SHEEP. A unit of learning to be assessed for

Internal Assessment Resource NCEA Level 1 Science AS KEEP CALM AND COUNT SHEEP. A unit of learning to be assessed for Internal Assessment Resource NCEA Level 1 Science AS 90949 KEEP CALM AND COUNT SHEEP A unit of learning to be assessed for KEEP NCEA CALM using AND Science COUNT 1.10 (AS90949) SHEEP 1 Contents.. Overview.................

More information

The Effect of Ram Exposure on Uterine Involution and Luteal Function During the Postpartum Period of Hair Sheep Ewes in the Tropics 1

The Effect of Ram Exposure on Uterine Involution and Luteal Function During the Postpartum Period of Hair Sheep Ewes in the Tropics 1 The Effect of Ram Exposure on Uterine Involution and Luteal Function During the Postpartum Period of Hair Sheep Ewes in the Tropics 1 R. W. Godfrey 2, M. L. Gray, and J. R. Collins Agricultural Experiment

More information

Approaches to Enhancing Lambing Rate from Out of Season Breeding

Approaches to Enhancing Lambing Rate from Out of Season Breeding Approaches to Enhancing Lambing Rate from Out of Season Breeding Presenter: Marlon Knights, PhD Associate Professor, Reproductive Physiology Division Animal and Nutritional Sciences Davis College of Agriculture

More information

RELATIONSHIP BETWEEN GROWTH OF SUFFOLK RAMS ON CENTRAL PERFORMANCE TEST AND GROWTH OF THEIR PROGENY

RELATIONSHIP BETWEEN GROWTH OF SUFFOLK RAMS ON CENTRAL PERFORMANCE TEST AND GROWTH OF THEIR PROGENY RELATIONSHIP BETWEEN GROWTH OF SUFFOLK RAMS ON CENTRAL PERFORMANCE TEST AND GROWTH OF THEIR PROGENY D. F. WALDRON, D. L. THOMAS, J. M. STOOKEY and R. L. FERNANDO, USA University of Illin o is, Department

More information

HERITABILITY ESTIMATES OF HATCHING

HERITABILITY ESTIMATES OF HATCHING HERITABILITY ESTIMATES OF HATCHING TIME IN THE FAYOUMI CHICKENS F. H. ABDOU H. AYOUB* Animal Production Department, Shebin El-Kom, Tanta Univ. Faculty of Agric., * Faculty of Agric., Ain Shams Univ., Cairo

More information

Richard Ehrhardt, Ph.D. Sheep and Goat Extension Specialist Michigan State University

Richard Ehrhardt, Ph.D. Sheep and Goat Extension Specialist Michigan State University Optimizing Reproductive Efficiency in Sheep Production with Strategic Nutritional Management Presenter: Richard Ehrhardt, Ph.D. Sheep and Goat Extension Specialist Michigan State University June 23, 2015

More information

Time of PMSG administration: Effect on progesterone and estradiol concentration in synchronized ewes.

Time of PMSG administration: Effect on progesterone and estradiol concentration in synchronized ewes. Biomedical Research 2013; 24 (1): 7-12 ISSN 0970-938X Time of PMSG administration: Effect on progesterone and estradiol concentration in synchronized ewes. Noor Hashida Hashim 1, Syafnir 2, Meriksa Sembiring

More information

University of Uludag, Faculty of Agriculture, Department of Animal Science Bursa, Turkey

University of Uludag, Faculty of Agriculture, Department of Animal Science Bursa, Turkey Journal of Animal and Feed Sciences, 18, 2009, 620 627 Effect of different dietary energy levels on the reproductive performance of Kivircik sheep under a semi-intensive system in the South-Marmara region

More information

Effect of Expected Peripheral Concentrations of Progesterone on Ovulation Rate and Litter Size in Barbados Blackbelly Ewes 1

Effect of Expected Peripheral Concentrations of Progesterone on Ovulation Rate and Litter Size in Barbados Blackbelly Ewes 1 Volume 24, 2009 Effect of Expected Peripheral Concentrations of Progesterone on Ovulation Rate and Litter Size in Barbados Blackbelly Ewes 1 E. H. Devonish 2, M. Knights 2, and E. K. Inskeep 2,3 1 Published

More information

FEEDING EWES BETTER FOR INCREASED PRODUCTION AND PROFIT. Dr. Dan Morrical Department of Animal Science Iowa State University, Ames, Iowa

FEEDING EWES BETTER FOR INCREASED PRODUCTION AND PROFIT. Dr. Dan Morrical Department of Animal Science Iowa State University, Ames, Iowa FEEDING EWES BETTER FOR INCREASED PRODUCTION AND PROFIT Dr. Dan Morrical Department of Animal Science Iowa State University, Ames, Iowa Introduction Sheep nutrition and feeding is extremely critical to

More information

FURTHER OBSERVATIONS ON FACE COVER SCORE IN CORRIEDALES, MERINOS AND THEIR RECIPROCAL CROSSBREEDS

FURTHER OBSERVATIONS ON FACE COVER SCORE IN CORRIEDALES, MERINOS AND THEIR RECIPROCAL CROSSBREEDS FURTHER OBSERVATIONS ON FACE COVER SCORE IN CORRIEDALES, MERINOS AND THEIR RECIPROCAL CROSSBREEDS B. C. JEFFERIE* Corriedale and Merino ewes 1961 were scored for face cover lambing, in September after

More information

Replacement Heifer Development. Changing Minds for the Change In Times Brian Huedepohl, DVM Veterinary Medical Center Williamsburg, Iowa

Replacement Heifer Development. Changing Minds for the Change In Times Brian Huedepohl, DVM Veterinary Medical Center Williamsburg, Iowa Replacement Heifer Development Changing Minds for the Change In Times Brian Huedepohl, DVM Veterinary Medical Center Williamsburg, Iowa Many changes have occurred that have brought about how some beef

More information

PREOVULATORY LH RELEASE AND OVULATION IN DRY AND IN LACTATING EWES AFTER PROGESTAGEN

PREOVULATORY LH RELEASE AND OVULATION IN DRY AND IN LACTATING EWES AFTER PROGESTAGEN -...---- PREOVULATORY LH RELEASE AND OVULATION IN DRY AND IN LACTATING EWES AFTER PROGESTAGEN AND PMSG TREATMENT DURING THE SEASONAL ANOESTRUM Y. COGNIE J. PELLETIER A. CARATY Station de Physiologie de

More information

Induction of plasma LH surges and normal luteal function in acyclic post-partum ewes by the pulsatile administration of LH-RH

Induction of plasma LH surges and normal luteal function in acyclic post-partum ewes by the pulsatile administration of LH-RH Induction of plasma LH surges and normal luteal function in acyclic post-partum ewes by the pulsatile administration of LH-RH P. J. Wright, P. E. Geytenbeek, I. J. Clarke and J. K. Findlay Department of

More information

EDUCATION AND PRODUCTION

EDUCATION AND PRODUCTION EDUCATION AND PRODUCTION Effects of Light Intensity from Photostimulation in Four Strains of Commercial Egg Layers: 1. Ovarian Morphology and Carcass Parameters R. A. Renema and F. E. Robinson 1 Department

More information

Relative Effectiveness of Estrous Synchronization Methods in the Ewe

Relative Effectiveness of Estrous Synchronization Methods in the Ewe South Dakota State University Open PRAIRIE: Open Public Research Access Institutional Reposiry and Information Exchange South Dakota Sheep Field Day Proceedings and Research Reports, 1985 Animal Science

More information

Late pregnancy nutrition the key to flock profitability

Late pregnancy nutrition the key to flock profitability Late pregnancy nutrition the key to flock profitability Dr. Tim Keady Animal and Grassland Research and Innovation Centre, Teagasc, Athenry, Co Galway. Introduction The plane of nutrition during late pregnancy

More information

Lifetime Wool. Optimising ewe nutrition to increase farm profit

Lifetime Wool. Optimising ewe nutrition to increase farm profit Lifetime Wool Optimising ewe nutrition to increase farm profit Answering the key questions On your farm, in your environment, with your sheep: - When are the critical times for ewe nutrition? What are

More information

Effects of altering growth curve and age at photostimulation in female broiler breeders. 2. Egg production parameters

Effects of altering growth curve and age at photostimulation in female broiler breeders. 2. Egg production parameters Effects of altering growth curve and age at photostimulation in female broiler breeders. 2. Egg production parameters R. A. Renema 1, F. E. Robinson 1,3, P. R. Goerzen 1, and M. J. Zuidhof 2 1 Department

More information

INFLUENCE OF THE SALT-FREE SALT DIET AND THE RAM EFFECT ON MAIN REPRODUCTIVE TRAITS OF EWES FROM SYNTHETIC POPULATION BULGARIAN MILK

INFLUENCE OF THE SALT-FREE SALT DIET AND THE RAM EFFECT ON MAIN REPRODUCTIVE TRAITS OF EWES FROM SYNTHETIC POPULATION BULGARIAN MILK 598 Bulgarian Journal of Agricultural Science, 15 (No 6) 2009, 598-603 Agricultural Academy INFLUENCE OF THE SALT-FREE SALT DIET AND THE RAM EFFECT ON MAIN REPRODUCTIVE TRAITS OF EWES FROM SYNTHETIC POPULATION

More information

GROWTH OF LAMBS IN A SEMI-ARID REGION AS INFLUENCED BY DISTANCE WALKED TO WATER

GROWTH OF LAMBS IN A SEMI-ARID REGION AS INFLUENCED BY DISTANCE WALKED TO WATER GROWTH OF LAMBS IN A SEMI-ARID REGION AS INFLUENCED BY DISTANCE WALKED TO WATER V. R. SQUIRES* Summary A feature of pastoral zone grazing systems is the long distances which separate the grazing area from

More information

Redacted for privacy

Redacted for privacy AN ABS TRACT OF THE THESIS OF Prabir Kumar Chakraborty for the (Name of student) Master of Science (Degree) in Animal Science (Dairy Production) presented on September 17, 1969 (Major) (Date) Title: Synchronization

More information

Milk yield measured by oxytocin plus hand milking and weigh-suckle-weigh methods in ewes originating from local crossbred in Turkey

Milk yield measured by oxytocin plus hand milking and weigh-suckle-weigh methods in ewes originating from local crossbred in Turkey Milk yield measured by oxytocin plus hand milking and weigh-suckle-weigh methods in ewes originating from local crossbred in Turkey N. ÜNAL *, F. ATASOY, H. AKÇAPINAR, S. KOÇAK, A. YAKAN, H. EROL and M.

More information

BLOOD LEVELS OF PROGESTERONE IN THE EWE

BLOOD LEVELS OF PROGESTERONE IN THE EWE BLOOD LEVELS OF PROGESTERONE IN THE EWE By D. G. EDGAR and J. W. RONALDSON From the Ruakura Animal Research Station, Department of Agriculture, Hamilton, New Zealand {Received 12 August 1957) SUMMARY Progesterone

More information

EDUCATION AND PRODUCTION. Layer Performance of Four Strains of Leghorn Pullets Subjected to Various Rearing Programs

EDUCATION AND PRODUCTION. Layer Performance of Four Strains of Leghorn Pullets Subjected to Various Rearing Programs EDUCATION AND PRODUCTION Layer Performance of Four Strains of Leghorn Pullets Subjected to Various Rearing Programs S. LEESON, L. CASTON, and J. D. SUMMERS Department of Animal and Poultry Science, University

More information

SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE AND OVULATION FOR REPRODUCTIVE BIOTECHNOLOGIES

SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE AND OVULATION FOR REPRODUCTIVE BIOTECHNOLOGIES MARCELO F.MARTINEZ ET AL. 26 SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE AND OVULATION FOR REPRODUCTIVE BIOTECHNOLOGIES Marcelo F. Martínez, Gabriel A. Bó, Reuben J. Mapletoft Western College of Veterinary

More information

Mastitis and the link to infertility

Mastitis and the link to infertility CONTINUING EDUCATION I LARGE ANIMAL Mastitis and the link to infertility Mastitis and infertility are the two most common disease complexes in dairy cattle worldwide. Both are major reasons for culling

More information

reproduction Cow-calf operations: calendar of operations Animal Science 144 Beef Cattle & Sheep Production R. D. Sainz Lecture 05

reproduction Cow-calf operations: calendar of operations Animal Science 144 Beef Cattle & Sheep Production R. D. Sainz Lecture 05 Cow-calf operations: reproduction Animal Science 144 Beef Cattle & Sheep Production R. D. Sainz Lecture 05 Cow-calf operations: calendar of operations 1 2 Anatomy - female Anatomy - male The estrous cycle

More information

Relationships between fat depots and body condition score or live weight in Awassi ewes.

Relationships between fat depots and body condition score or live weight in Awassi ewes. Relationships between fat depots and body condition score or live weight in Awassi ewes. Treacher T., Filo S. in Purroy A. (ed.). Body condition of sheep and goats: Methodological aspects and applications

More information

SHLEEP RESEARCH. --- ~I ~~~_ rrrrr~s~ 1954 to /969 ..~ Agricultural Experiment Station AUBURN UNIVERSITY X10,4 ~ BULLETIN 394 OCTOBER 1969

SHLEEP RESEARCH. --- ~I ~~~_ rrrrr~s~ 1954 to /969 ..~ Agricultural Experiment Station AUBURN UNIVERSITY X10,4 ~ BULLETIN 394 OCTOBER 1969 BULLETIN 394 OCTOBER 1969 X10,4 ~ Agricultural Experiment Station AUBURN UNIVERSITY E. V. Smith, Director Auburn, Alabama SHLEEP RESEARCH 1954 to /969 --- ~I ~~~_ rrrrr~s~ 7;..~ CONTENTS Page IN T R O

More information

Lifetime Production Performance by Suffolk x Rambouillet Ewes in Northwestern Kansas

Lifetime Production Performance by Suffolk x Rambouillet Ewes in Northwestern Kansas November 1986 Lifetime Production Performance by Suffolk x Rambouillet Ewes in Northwestern Kansas Frank J. Schwulst Colby Branch Experiment Station In late August, 1979, 50 Suffolk x Rambouillet ewe lambs,

More information

Josefina de Combellas, N Martinez and E Gonzalez. Instituto de Producción Animal, Facultad de Agronomia, Universidad Central de Venezuela, Maracay

Josefina de Combellas, N Martinez and E Gonzalez. Instituto de Producción Animal, Facultad de Agronomia, Universidad Central de Venezuela, Maracay Trop Anim Prod 1980 5:3 261 A STUDY OF FACTORS WHICH INFLUENCE BIRTH AND WEANING WEIGHT IN LAMBS Josefina de Combellas, N Martinez and E Gonzalez Instituto de Producción Animal, Facultad de Agronomia,

More information

Reproductive Vaccination- Deciphering the MLV impact on fertility

Reproductive Vaccination- Deciphering the MLV impact on fertility Reproductive Vaccination- Deciphering the MLV impact on fertility Safety Decision Efficacy Prebreeding Vaccination of Cattle should Provide fetal & abortive protection (BVD and BoHV-1) Not impede reproduction

More information

HORMONAL CONTROL OF REPRODUCTIVE ACTIVITY IN THE EWE

HORMONAL CONTROL OF REPRODUCTIVE ACTIVITY IN THE EWE University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Publications from USDA-ARS / UNL Faculty U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska

More information

FOLLICULAR GROWTH PATTERN IN BUFFALOES SYNCHRONIZED TO ESTRUS WITH PROGESTERONE IMPREGNATED INTRAVAGINAL SPONGES

FOLLICULAR GROWTH PATTERN IN BUFFALOES SYNCHRONIZED TO ESTRUS WITH PROGESTERONE IMPREGNATED INTRAVAGINAL SPONGES International Journal of Science, Environment and Technology, Vol. 3, No 3, 2014, 960 965 ISSN 2278-3687 (O) FOLLICULAR GROWTH PATTERN IN BUFFALOES SYNCHRONIZED TO ESTRUS WITH PROGESTERONE IMPREGNATED

More information

Time of lambing analysis - Crossbred Wagga NSW

Time of lambing analysis - Crossbred Wagga NSW Page 1 of 36 04 Aug 2010 14:47 Time of lambing analysis - Crossbred ewes @ Wagga NSW 1/01/1980-31/12/2008 Analysis Summary Time of lambing report Gross margin table Long term averages for financial year

More information

SERUM BIO-CHEMICAL PROFILES OF CROSS-BRED PIGS DURING DIFFERENT REPRODUCTIVE PHASES

SERUM BIO-CHEMICAL PROFILES OF CROSS-BRED PIGS DURING DIFFERENT REPRODUCTIVE PHASES Int. J. Agrl.Sc Sc. & Vet.Med. Med. 2013 2013 K Venkataramana et al., 2013 Research Paper ISSN 2320-3730 www.ijasvm.com Vol. 1, No. 3, August 2013 2013 Meghana Publications. All Rights Reserved SERUM BIO-CHEMICAL

More information

EFFECT OF CRUDE PROTEIN LEVELS AND FOLLICLE STIMULATION ON EGG PRODUCTION OF AGED HENS

EFFECT OF CRUDE PROTEIN LEVELS AND FOLLICLE STIMULATION ON EGG PRODUCTION OF AGED HENS Nigerian Journal of Physiological Sciences 19(1-2): 77-81 Physiological Society of Nigeria 2004 77 EFFECT OF CRUDE PROTEIN LEVELS AND FOLLICLE STIMULATION ON EGG PRODUCTION OF AGED HENS V. A. TOGUN *1,,2

More information

Estrus synchronizing potential of luchis estrus milk in wad sheep and wad goats

Estrus synchronizing potential of luchis estrus milk in wad sheep and wad goats Available online at www.scholarsresearchlibrary.com Annals of Biological Research, 2014, 5 (10):35-39 (http://scholarsresearchlibrary.com/archive.html) ISSN 0976-1233 CODEN (USA): ABRNBW Estrus synchronizing

More information

PROBABLE NON-BREEDERS AMONG FEMALE BLUE GROUSE

PROBABLE NON-BREEDERS AMONG FEMALE BLUE GROUSE Condor, 81:78-82 0 The Cooper Ornithological Society 1979 PROBABLE NON-BREEDERS AMONG FEMALE BLUE GROUSE SUSAN J. HANNON AND FRED C. ZWICKEL Parallel studies on increasing (Zwickel 1972) and decreasing

More information

OVUM TRANSPORT IN THE EWE. By P. J. HOLST* and A. W. H. BRADENt. [Manuscript received 26 August 1971] Abstract

OVUM TRANSPORT IN THE EWE. By P. J. HOLST* and A. W. H. BRADENt. [Manuscript received 26 August 1971] Abstract OVUM TRANSPORT IN THE EWE By P. J. HOLST* and A. W. H. BRADENt [Manuscript received 26 August 1971] Abstract Ovum transport was examined using 60 mature Border Leicester X Merino ewes, the time of ovulation

More information

Effects of photostimulatory lighting and feed allocation in female broiler breeders 1. Reproductive development

Effects of photostimulatory lighting and feed allocation in female broiler breeders 1. Reproductive development Effects of photostimulatory lighting and feed allocation in female broiler breeders 1. Reproductive development F. E. Robinson 1, R. A. Renema 1, L. Bouvier 1, J. J. R. Feddes 1, J. L. Wilson 2, M. Newcombe

More information

SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE, LUTEAL REGRESSION, AND OVULATION FOR FIXED-TIME ARTIFICIAL INSEMINATION IN BEEF COWS AND HEIFERS

SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE, LUTEAL REGRESSION, AND OVULATION FOR FIXED-TIME ARTIFICIAL INSEMINATION IN BEEF COWS AND HEIFERS SYNCHRONIZATION OF FOLLICULAR WAVE EMERGENCE, LUTEAL REGRESSION, AND OVULATION FOR FIXED-TIME ARTIFICIAL INSEMINATION IN BEEF COWS AND HEIFERS A Dissertation by KYLE JEFFREY STUTTS Submitted to the Office

More information

Can. J. Anim. Sci. Downloaded from by on 04/12/19. Lethbridge Research Station, Canada Department

Can. J. Anim. Sci. Downloaded from   by on 04/12/19. Lethbridge Research Station, Canada Department .AMB PRODUCTON FROM WS OF FOUR BRDS AND THR TWO.BRD AND THR.BRD CROSSS J. A. VSLY and H. F, PTRS' Research Station, Agriculture Canada, Lethbridge, Alberla, Canada T 481, Received 9 July 1974, accepted

More information

THE EFFECTS OF FEEDING HIGH-LINOLEIC SAFFLOWER SEEDS ON ESTRUS SYNCHRONIZATION IN BEEF HEIFERS. Kaitlyn Claire Spence

THE EFFECTS OF FEEDING HIGH-LINOLEIC SAFFLOWER SEEDS ON ESTRUS SYNCHRONIZATION IN BEEF HEIFERS. Kaitlyn Claire Spence THE EFFECTS OF FEEDING HIGH-LINOLEIC SAFFLOWER SEEDS ON ESTRUS SYNCHRONIZATION IN BEEF HEIFERS by Kaitlyn Claire Spence A thesis submitted in partial fulfillment of the requirements for the degree of Master

More information