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1 1 Reproductive Management in Goats Lionel J. Dawson 002 Farm Road Boren Veterinary Medical Teaching Hospital Oklahoma State University Stillwater, OK Phone: Fax:

2 Abstract Goats are generally classified as a seasonally polyestrous or short day breeders in the U.S. The degree of seasonally varies among breeds and their location (latitude).the annual reproductive cycle of goats in a temperate region can be divided into breeding season or period, nonbreeding season or physiologic anestrous period and transitional period. Transitional period is between the nonbreeding and the breeding season. The onset of the breeding season commences after June 21 st (summer solstice). In July and August or during their transitional period, some of the does will show estrus activity, but majority of the does will start cycling regularly in late September, resulting in the kids born late winter or early spring. With the rapid increase in meat goats in the U.S., estrus synchronization has been used as an effective tool in the reproductive management of these herds. Synchronization early in the breeding season, will allow increased proportion of doe s becoming pregnant early, older and uniform size of kids at weaning, take advantage of the niche in the market during religious events and rising price trends in the market. Synchronization of estrus in does includes techniques such as alteration of light patterns, manipulation of social interaction with the buck exposure early in the breeding season, and manipulating the estrous cycle by extending or shortening the luteal phase of their cycle. In does during the breeding season the opportunity to control their cycle is greater during the luteal phase, which is of longer in duration and is more responsive to manipulation. 19

3 Introduction Reproductive Management in Goats The goat (Capra hircus) and sheep (Ovis aries) are two distinct species in the family Bovidae. The world sheep population is estimated at 1.3 billion and the goat population around 1.0 billion. Both species were among the first to be domesticated by man for meat and fiber. There are different breeds seen throughout the world. The goats tend to be located in the more arid areas of the world while the sheep are raised in very diverse environments. In North America goats are seasonally polyestrous or short day breeders. The length of the breeding season is influenced by photo period, breed, location and nutrition. There is not only great variation between breeds as regards to the length of the breeding season, but there are variations within breeds. Selecting a breed, and also individuals with long breeding season could be utilized as a management tool in managing goats for production. Photoperiod and its influence on the secretion of melatonin from the pineal gland are important signals for cyclicity of does in the fall. The influence of photoperiod, and its effect on cyclicity, is mediated through the release of gonadotropic releasing hormone (GnRH) from the hypothalamus, and the release of luteinizing hormone (LH) from the anterior pituitary gland. Reproductive management: Breeds: Common lactating breeds seen in North America are Alpine, Saanen, Toggenburg, Nubian and LaMancha. Meat breeds seen are Boers, Spanish, Kiko and Tennessee Stiff Legged. Fiber producing breeds seen are Angora and Spanish (Cashmere). Nubian, Nubian crosses and Boers tend to have a longer breeding season (June-March) due to their origin near the equator. In contrast British and European goat breeds (Saanen, Toggenburg and French 1, 3-5 Alpine) have a more restricted breeding season (September February).

4 Puberty: Puberty in goats is defined as onset of changes when the doe or buck becomes sexually mature and able to reproduce. It is the maturation of the hypothalamo pituitary ovary/testicular axis. 1,3-5 Onset of puberty in goats primarily depends on age, breed, nutrition, body weight or size, management, season and disease status of the herd. Goats reach puberty around 6 to 8 months of age, some breeds or individuals within a breed may reach puberty as early as 3 months. The range is around 3 to 15 months. Bucklings usually reach puberty earlier than doelings. Cross breeds usually reach puberty earlier than the purebreds. Size or body weight plays an important role when the doe will reach puberty, and it depends on genetics, nutrition and management. Doelings which grow faster in size and weight and will reach puberty earlier. Time of year when kids are born plays an important role when the kids will reach puberty. Kids born early (Jan-Feb) more likely to reach puberty and cycle that fall. Late born kids (March- June) may not reach puberty and breed until the 2 nd fall after birth. Chronic diseases or conditions in the doelings (Parasites internal and external, Caseous Lymphadenitis, and Pneumonia etc.) will delay puberty. Bucks: Scrotal circumference in rams plays an important role, when their sons and daughters will reach puberty, and also has influence on the twinning rates in their daughters. Bucks with scrotal circumference will potentially produce good quality semen; and have a positive influence on fertility and litter size. 6, 7, Seasonality: The underlying influence of photo period effect on estrus activity is mediated through the secretion of luteinizing hormone (LH) from the anterior pituitary gland. Final maturation and ovulation of ovarian follicles is dependent on sufficient LH secretion. During the anovulatory (anestrus) season, estrogen secretion from the follicles strongly inhibits LH release. As photoperiod begins to decrease (late summer-fall), this inhibitory effect is lost

5 and there is increased LH release leading to ovulation and cyclicity. 7 Alternating inhibitory influence of estrogen from cycling to non-cycling seasons may be due to changes in melatonin production from the pineal gland, mediated through changes in light perceived by the eyes. Regardless, the important point to remember is that the does become anestrus due to reduced LH secretion. Thus, without sufficient LH, the ovaries are virtually inactive. To get anestrus does to cycle out of season, one must increase the LH release by increasing follicular growth, by providing Follicular Stimulating Hormone or gonadotropins containing FSH to stimulate ovarian activity. 1,3-6 Under natural circumstances the onset of estrus activity within a group of does is characterized by an increasing percentage of the group exhibiting estrus over a time. The time of the year, 90% of the group will cycle regularly will depend on the breed, location and nutritional status. Majority of the does will exhibit estrous activity in fall, between September to November in North America. Buck exposure: Exposure to bucks during the non-breeding or off season can trigger low percentages of does to cycle. The male effect is probably mediated through pheromones produced by the buck and increasing LH production in the does. Exposure of does to vasectomized or intact bucks late in the transition period induces estrus and ovulation in the majority of the does % of the does will later short cycle in 8-10 days due to premature luteal regression after buck exposure. Normally there are three peaks of estrous activity when first introduced to bucks in late transition (3-4 days, 7-12 days, and days). 1-6 Flushing: To increase the ovulation rate in does, a period of nutritional flushing (increased energy intake) for 4 weeks is effective prior to breeding. Flushing seems to help does which are poor in body condition during the transition period.

6 Estrous cycle: The normal length of their estrous cycle during the peak of their breeding season is around days (average 21 days). The peak of the breeding season in the mid-west is between October to December. The estrous cycle length in Angora s are shorter, and is around 16 to 18 days, whereas for a pygmy is greater than 21 days. The period of receptivity or estrus is around 24 (12-36 ). Doelings are in estrus for about 24, and does 24 to 48. Ovulation is towards the end of the estrus period. Usually 12 after the onset in a doeling, and after the onset in a doe. 1-5 Bucks: Bucks are seasonal breeders too. Decreasing the daylight stimulates the pulsatile release of GnRH. Thereby stimulating the release of LH and FSH, resulting in increasing spermatogenesis and testosterone production in the testes. Increased androgens in turn stimulates accessory sex glands and sexual behavior (libido), increase in testicular size ( 3-5 cms of scrotal circumference), testicular weight and gonadal sperm reserve.sperm quality like motility, morphology and concentration are lower during the longer daylight or anestrus period Estrus: Estrus behavior seen in a doe are, restlessness, increase vocalization, occasional mounting, rapid tail wagging, swollen vulva, mucus discharge, frequent urination and decrease in milk production. Bucks will nose the perineum and udder, flick their tongue, strike with their forelimb and make low bleating sounds. He may butt or push doe s hindquarters with his shoulder, and line up directly behind the doe and mount. 1-6 Breeding: Common breeding techniques used in goats are, hand mating, pen mating and artificial insemination. Hand mating is a common practice done in dairy goats, by taking the doe to the buck to be bred. Pen mating is leaving the buck with the does for a certain period in a pen or pasture. Artificial insemination is a technique to deliver the semen other than a buck to the

7 doe. And are usually performed 12 and 24 after onset of estrus, when the cervical mucus changes from clear to cloudy. 1-5 Estrus detection is very important if artificial insemination is going to be practiced. 1) Does actively seek the buck. 2) Does prefer bucks with intact scent glands. 3) Buck jar rub cloth or rag over the scent glands of intact bucks and place it in jar. Opening the jar and exposing the rag to the does may be helpful in detecting estrus in does when there is no buck present. 4) Buck beard trimmed during the breeding season, put in a zip lock bag and the bag opened and exposed to does once or twice a day. 5) Fence line exposure by exposing the buck across the fence to the does. 6) Use of intact bucks with breeding aprons or teaser bucks in the pens with the does Inducing cyclicity in a doe is mainly done by a) male effect during the late transitional period and early breeding season, b) light effect and 3) using exogenous hormones. During the transitional period (late July to early September), buck effect is a powerful tool to induce estrus (Table1). Sudden introduction of previously isolated bucks will stimulate a surge of LH followed by ovulation, and majority of the doe s exhibit estrous within ,7-13, to 60 % of the does will cycle back or short cycle and show estrus behavior and ovulate again within 3-5 days or 7-12 days after introduction of the buck. Three peaks of activity have been observed, after the introduction of the buck, 3-5 days, 7-12 days and 28 to 35 days after introduction to the buck. 1, 21 This phenomenon of cycling back in 7 to 12 days is described as early luteal regression (ELR). 15, 16, The current thinking is that early luteal regression maybe due to lack of

8 progesterone priming of the uterus during anestrus period, and thereby having positive effects of estradiol from the follicles on the uterus. Estrogen increases the availability of oxytocin receptors, leading to the release of endogenous prostaglandin from these receptors, and thus lysing or regressing the corpus luteum. Doe s that were supplemented with progesterone in late- transition, and removed on the day the bucks were introduced, had higher percentage of does showing estrus, and reducing the number of short cycles. 1,16-18 Buck effect and exogenous progesterone are methods commonly employed to induce estrus in the transition period and to prevent ELR (Table 1) Photoperiod manipulation is done by altering the day length. Decreasing day length will increase the levels of melatonin produced by the pineal gland. Melatonin production may influence the secretion of LH from the anterior pituitary gland, and hasten the cyclicity Melatonin will increase the pulsatile release of GnRH, thereby increasing the frequencies of FSH and LH release. Increase levels of LH release will cause ovulation, and thus enabling doe to cycle regularly. Changes in light exposure or decreasing day length require at least days to induce a doe to cycle. Gradual change is not necessary, the amount of change that is perceived by the eye is important. A reduction of light is effective to trigger cyclicity in 30 to 60 days in a 31, 36, 51, 52 doe. In does during the breeding season the opportunity to control their cycle is greater during the luteal phase, which is of longer in duration and is more responsive to manipulation. Strategies can be employed for synchronization, is to extend the luteal phase by supplying exogenous progesterone (Table 4) or to shorten this phase by prematurely regressing the existing corpus luteum (CL) by using prostaglandins (Table 3). 1,14-19 Hormones have been used in goats to manipulate the estrous cycle, but none have been approved for use in goats in the U.S.

9 Extending the luteal by supplying exogenous progesterone is best done by using Controlled Internal Drug Release devices (CIDR), intravaginal sponges and feed supplements. 14 Regressing the corpus luteum is best done by utilizing prostaglandins. Progesterone or progestagens products commonly used are CIDR s and sponges (Veramix, Repromap, Sincrocel, Cronolone and Chronogest). Shortening the luteal phase is best done by using Lutylase (Dinoprost tromethamine) and Estrumate (Cloprostenol). 1,14-19 To better control or synchrony of estrus and ovulation, extending the luteal phase with progesterone, along with a gonadotropin (FSH) and prostaglandin have been used. The gonadotropin like equine gonadotropin (ecg) is commonly used because of its longer half-life. The drawback of using higher doses ecg may result in larger number of anovulatory follicles, and repeated doses can cause declining fertility due to the buildup of antibodies against ecg. 1,14,20 ecg is not commercially available in the U.S. But a product containing ecg and a Human Chronic Gonadotropin (HCG), which has been labeled to be used in swine (PG 600) has been tried and has been in goats. Dosage of PG 600 utilized in does is 200 units of ecg units of HCG (1/2 dose) during the breeding season or 400 units of ecg units of HCG (full dose) during the non-breeding or off season. If ecg is used, 200 units of ecg during the breeding season and 400 units of ecg during the non-breeding or off season. Out of season breeding in doe s could be done manly by using hormones or manipulating the photo period to fasten the onset of estrus. Out of season breeding will enable the farmer or producer to take their kid crop to market when prices are higher, have year round milk production in dairy animals and also increase the number of kids born to the doe during her life time. Hormones are commonly used effectively to synchronize estrus in this period. Incorporating a follicle stimulating hormone into the protocol is very essential to stimulate

10 follicular waves during the non-breeding season or off season. Equine Chorionic Gonadotropin (ecg) is commonly used. In the U.S., PG 600 which contains ecg is available in the US and has been used successfully used in goats (Table2) Table 1 Different methods employed to hasten cyclicity during the transition period Method Duration Estrous 1.Buck effect Late transition ,9-11, Progesterone(12-14 days) + equine chorionic Early transition gonadotropin(ecg) on the day or prior to removal 3. Progesterone(12-14days) + ecg on the day or 24 to 48 Late transition prior to removal 4. Progesterone(10days) +ecg(removal) +prostaglandin 48 prior to removal Late transition This table is adapted from Current Therapy in Large Animal Theriogenology

11 Table Methods employed during the non-breeding season Method Duration Estrus Progesterone days ,14,15 + Equine Chorionic Gonadotropin On the day of removal or before +Prostaglandin On the day of removal or before <72-90% in estrus Artificial lights Mimic long days for 60 days followed by short days for 60 days or natural light days during short days 31 Melatonin (Implant, oral, or injection) days days Artificial lights + melatonin Mimic long days for 60 days followed by melatonin for days Buck exposure 60 days into melatonin treatment; estrus 2-3 days

12 Table 3: Lutalyse (Dinoprost tromethamine) Shortening the luteal phase Product Dosage Treatment Route Estrus 5-10 milligrams Estrumate (Cloroprostenol) micrograms 2 injections, 11 to 12 days apart in does 2 injections, 11 to 12 days apart l/m (48-60 ) TAI l/m (48-60 ) TAI=

13 Table 4: Progesterone in Combination with Prostaglandin & Gonadotropin 198 Product Dosage Location Duration ecg Prostaglandin Season Estrus Breeding PG Rate CIDR-G 330mg Progesterone Vagina 16 days + Removal Breeding Season 47% 53 CIDR-G CIDR-G CIDR-G CIDR-G CIDR-G 330mg Progesterone 330mg Progesterone 330mg Progesterone 330mg Progesterone 330mg Progesterone Vagina 9 days + Removal + Removal Vagina 9 days + Removal Vagina 13 days + Removal Vagina 5 days + Removal Vagina days + PG600 + [1] with CIDR-G insertion Breeding Season Breeding Season Breeding Season Breeding Season or Non- Breeding Season + Non- Breeding Season AI after sponge removal Natural Service Natural Service AI after the onset TAI AI 54 TAI AI 48 Natural Service 95% 54 65% 54 63% 55 63% 56 49% % (Dawson)

14 14 Extending the luteal phase CIDR/ Lutylase Insert CIDR NS or A.I.= 24 after standing estrus TAI= 52 to 56 after CIDR removal Removed 5-10mg Dinoprost tromethamine (1-2cc Lutylase)

15 CIDR + PG 600 +Lutylase CIDR/ Lutylase 0 Insert CIDR 0 5 Insert CIDR NS or A.I =24 after standing estrus TAI = 42 to 48 after CIDR removal NS or A.I.= 24 after standing estrus TAI= 52 to 56 after CIDR removal mg Dinoprost tromethamine (1-2cc Lutylase) Remove CIDR Give 5cc PG600 during the off season 13 ½ dose during the breeding season (400 units ecg and 200 units HCG) Removed 5-10mg Dinoprost tromethamine (1-2cc Lutylase)

16 References 1. Dawson LJ: Manipulating the estrous cycle in a doe. Current Therapy in Large Animal Theriogenology Second edition Dawson LJ: Clinical examination of the female reproductive tract. Current Therapy in Large Animal Theriogenology. Second edition Smith MC: Clinical reproductive physiology and endocrinology in does. Current Therapy in Large Animal Theriogenology. Second edition Smith MC, Sherman D.M: Reproductive System, Goat Medicine. Second edition Dawson LJ: Reproductive Management in goats. Proceedings of the Annual Caribbean Veterinary Medical Association meeting at Trinidad. Nov Senger PL: Regulation of reproduction, Puberty and Reproductive cycle. Pathways to Pregnancy and Parturition. Second edition Keisler DH: Endocrine control of reproduction in the ewe and ram: a review. Proceedings of small ruminant short course. ACT & SFT 1994, pp Moss GE, Crowder ME, Nett TM: GnRH-receptor interaction. VI. Effect of progesterone and estradiol on hypophyseal concentrations of gonadotrophin-releasing hormone secretion in the ewe. Biol Reprod 1981;25: Barrell GK et al: Seasonal changes of gonadotrophin-releasing hormone secretion in the ewe. Biol Reprod 1992;46; Karsch FJ et al: Seasonal changes in gonadotrophin-releasing hormone secretion in the ewe; alteration in response to the negative feed back action of estradiol. Biol Reprod 1993; 49; Smith MC. Small Ruminant Theriogenology for practitioners. Proceedings of the Annual SFT and ACT Conference, 2004, pp Rowe ID: Reproductive management of sheep and goats. Proceedings of the Annual Meeting of the AVMA, Schaumburg, IL, 1998, p Rowe JD, East NE: Reproductive management-estrous cycles, synchronization, centrificial insemination, pregnancy diagnosis in small ruminants for the mixed practitioner. Proceedings of the Western Veterinary Conference, Las Vegas, NV, 1998, p Wildeus, S: Current concepts in synchronization of estrus: sheep and goats. Proceedings of the American Society of Animal Science, , pp Whitley NC, Jackson DJ: An update on estrus synchronization in goats: a minor species. J Anim Sci 2004;82 (E Suppl):E Bretzlaff K: Control of the estrous cycle. In Youngquist RS (ed): Current therapy in large animal theriogenology. St. Louis: Elsevier, 1997, pp Keisler DH, Buckrell BC: Breeding strategies in ewes. In Youngquist RS (ed): Current therapy in large animal theriogenology. St Louis: Elsevier, 1997, pp Buckrell BC: Hormonal management of breeding in sheep and goats. Proceedings of the Small Ruminant Short Course (ACT and SFT), Kansas City, Mo, August 1994, pp Pugh DG: Female reproduction in the ewe and doe. In Sheep and goat medicine. Philadelphia: WB Saunders, 2002, p Baril G, Remy B, Leboeuf B, et al: Synchronization of estrus in goats. The relationship between ecg binding in plasma, time of occurrence of estrus and forcibly following artificial insemination. Theriogenology 1996; 45:

17 Chimineau P: Possibilities for using bucks to stimulate ovarian and estrous cycles in anovulatory goats a review. Livestock Prod Sci 1987; 17: Ott RS, Nelson DR, Hixon JE: Effect of presence of the male on initiation of estrus cycle activity of goats. Theriogenology 1980; Mellado M, Olivas R, Ruiz F: Effect of buck stimulus on mature and pre-pubertal norgestomet treated goats. Small Ruminant Res 2000; 36(3): Beard AP, Hunter MG: Effects of bovine follicular fluid and exogenous estradiol on the GnRH induced short luteal phase in anestrus ewes. J Reprod Fertil 1994; Baltye HM, Fairclough RJ, Cameron AWN, et al: Evidence for prostaglandin involvement in early luteal regression of the super ovulated nanny goat. J Reprod Fertil 1988; Chimenineau P: Effects of a progestogen on buck induced short ovarian cycles in the Creole meat goat Anim Reprod Sci 1985; 9: Zarkawi M, Al-Merestani MR, Wardeh MF: Induction of synchronized oestrous in indigenous Damascus goats outside the breeding season. Small Ruminant Res 1999; 33(2): Leboeuf B, Forgerit Y, Bernelas D, et al: Efficacy of two types of vaginal sponges to control onset of oestrus, time of preovulatory LH peak and kidding rate in goats inseminated with variable number of spermatozoa. Theriogenology 2003; 60: Freitas VJF, Baril G, Saumande J: Estrus synchronization in dairy goats in use of fluorogestone acetate vaginal sponges or norgestomet ear implants. Anim Reprod Sci 1997; 46: Freitas VJF, Baril G, Bose M, Saumande J: The influence of ovarian status response to estrus synchronization treatment in dairy goats during the breeding season. Theriogenology 1996; 45: BonDurant RH, Darian BJ, Munvo CJ, et al: Photoperiod induction of fertile oestrus and changes in LH and progesterone concentration in yearling dairy goats. J Reprod Fertil 1981; 63: Shelton M: Reproduction and breeding of goats. J Dairy Sci 1978; 31: East NE, Rowe JD: Subcutaneous progestin implants verses intra vaginal sponges for dairy goats estrus synchronization during the transitional period. Theriogenology 1989; 32(6) Dawson, L.J. Estrus syndsous synchronization in does. Proceedings of the small ruminant reproduction. WSU Pierson JT, Baldassarre H, Keefer CL, Downey BR: Seasonal variation in preovulatory events associated with synchronization of estrus in dairy goats. Theriogenology 2001; 56(5) Chimeneau P, Normant E, Ravault JP, Thimonier L: Induction and persistence of pituitary and ovarian activity in the out-of-season lactating dairy goat after a treatment combining a skeleton photoperiod, melatonin and the male effect. J Reprod Fertil 1986; 78: Amoah EA, Gelaye S, Guthrie P, et al: Breeding season and aspects of reproduction of female goats. J Animal Sci 1996; 74: Keisler DH: Endocrine control of reproduction in the ewe and ram. Proceedings of Small Animal Ruminant Short Course (ACT and SFT), Kansas City, MO August 1994, pp 2-31.

18 Lincoln GA, Short RV: Seasonal breeding: nature s contraceptive. Recent Prog Horm Res 1980; 36: Karsch FJ: The hypothalamus and anterior pituitary gland. In Austin CR, Short RV (eds): Reproduction in mammals: hormone control of reproduction. Cambridge: University Press, 1984, pp Goodman RL, Karsch FJ: The hypothalamic pulse generator: a key determinant of reproductive cycles in sheep. In Follett BK, Bollett DE (eds): Biological clocks and seasonal reproductive cycles. Bristol: John Wright Pub., 1981, pp Thiery JC, Pelletier J: Multiunit activity in the anterior median eminence and adjacent areas of the hypothalamus of the ewe in relation to LH secretion. Neuroendocrinology 1981; 32: Clarke IJ, Cummins JT: The temporal relationship between gonadotropin releasing hormone (GnRH) and luteinizing hormone (LH) recreation in ovariectomized ewes. Endocrinology 1982, 111: I Anson H, Herbosa CG, Ebling FJ, et al: Hypothalamic versus pituitary stimulation of luteinizing hormone secretion in the prepubertal female lamb. Neuroendocrinology 1993; 57: Jansen HT, Khalid M, Jackson GL: N-Methyl-D,L-aspartate induces a transient increase in LH secretion in the seasonally anestrous ewe. Domest Anim Endocrinol 1991, 8: Kindler JE, ML, Kittok RJ: Endocrine regulation of puberty in cows and ewes. J Reprod Fertil (suppl) 1987; 34: Karsch FJ, Goodman RL, Legon SJ: Feedback basis of seasonal breeding: Test of an hypothesis. J Reprod Fertil 1980; 580: Moss GE, Crowder ME, Nett TM: GnRH-receptor interaction. VI. Effect of progesterone and estradiol on hypophyseal concentrations of gondaotrophins in ovariectomized ewes. Biol Reprod 1981; 25: Reeves JJ, Arimura A, Scally AV: Changes in pituitary responsiveness to luteinizinghormone, releasing hormone (LH-RH) in anestrous ewes pretreated with estradiol benzoate. Biol Reprod 1971; 4: Moenter SM, Caraty A, Lacatelli A, Karsch FJ: Pattern of gonadotrophin-releasing hormone (GnRH) secretion leading up to ovulation in the ewe: existence of a preovulatory GnRH surge. Endocrinology 1991; 129: VonBrackel-Bodenhauser A, Wuttke W, Holtz W: Effects of photoperiod and slowrelease preparations of bromocriptine and melatonin on reproductive and prolactin secretion in female goats. J Anim Sci 1994;72: Wuliji T, Litherland A, Goetsch AL, et al: Evaluation of melatonin and bromocryptine administration in Spanish goats. Small Ruminant Res 2003; 49(1): Motlomelo KC, Greyling, JPC, Schwalbach MJ: Synchronization of estrus in goats: the use of different progestagen treatment. Small Ruminant Res 2002; 45(1) Oliveira MA, Guido SI, Lima DF: Comparison of different protocols used to insure and synchronize estrus cycle of Saanen goats. Small Ruminant Res 2001; 40: Romano JE: Synchronization of estrus using CIDR, FGA or MAP intravaginal pessaries during the breeding season in Nubian goats. Small Ruminant Res 2004; 55(13): Menchaca A, Rubianes E: Pregnancy rate obtained with short term protocol for timed AI in goats. Repro Dom Anim. 42, (2007)

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