Biology of rodents and lagomorphs Joanna Godawa Stormark. Taxonomy of rodents. Order: Rodentia (rodents) Class : Mammalia (mammals)
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1 Biology of rodents and lagomorphs Joanna Godawa Stormark Taxonomy of rodents Class : Mammalia (mammals) Order: Rodentia (rodents) Family: Muride (rats and mice) Sub-family: Murinae Genus: Mus Species: Mus musculus Linnaeus, 1758 Genus: Rattus Species: Rattus norvegicus (Berkenhout, 1769)
2 Rodent origin and distribution Rodent are monophyletics The sub-family Murinae emerged in Southeastern Asia at the end of the oligocene and the start of the miocene periodes (25-20 mill. years ago) Occurs throughout the world, excluding Antartica Rodent features 2 pairs of incisors in the upper and lower jaw Behind the incisors is a large gap in the tooth rows called diastema Most species are nocturnal Most species are continuously polyoestrous
3 Rodent diet Most species are herbivores, some are omnivores and insectivores Herbivore rodents are coprophagous The mouse
4 Mouse breeding The modern laboratory mouse is a hybrid of three sub-species: Mus musculus musculus, M. m. domesticus and M. m. castaneus Lifespan is 1-2 years Mouse as all rodents is polyoestrouse Sexual cycle lasts 5 (4-7) days The Whitten effect occurs the synchronization of the estrous cycles of female exposed to the pheromones of a male The Bruce effect occurs - the exposure of a recently bred mouse to the pheromones of a strange male mouse prevent implantation or produce pseudopregnancy Lee Boot effect occurs Mouse breeding The gestation period is 20 days The average litter size is The pups weigh 0.5 to 1.5 grams at birth Pups are weaned at 3 weeks of age
5 Mouse behaviour Nocturnal Laboratory mice lack rapid running behavior freezing behavior in open landscapes Fighting is related to establishment of hierarchy and defence to territory Barbering local loss of hear and whiskers Mice is a social animal Mouse as laboratory animals First utilized as laboratory animals in studies of reproduction and blood circulation Mendel s rule was tested in laboratories all over the world: (Bateson 1903) in England, (Cuenot 1908) France and (Castle 1901) in USA Castle and Allen (1903) for the first time described albino mice as recessive strains Tumor experiments influenced the development of different inbred strains such as A,C, CBA, C3H, C57BL/J, C57BL/10, BALB/c and others.
6 Mouse as laboratory animals In the 1920 s and in the 30 s, inbred mice were not commercially available This changed dramatically over the next 15 years, especially when The Jackson Laboratory emerged and sold mice all over the world The rat
7 Rat breeding The rat was the first mammal to be bred for use as a laboratory animal Lifespan as in house-mice Sexual cycle as in house-mice The Whitten effect occurs but is not as pronounced as in mice The Bruce effect does not occur in rats Differencies between Rattus rattus and R. norvegicus
8 Rat breeding The gestation period is 22 days The average litter size is 6-12 The pups weigh 5-6 grams at birth Cannibalism is uncommon except with new mothers Pups are weaned at 3 weeks of age Rat as laboratory animal In the 18th and 19th century rats were first caught and bred for use in rat-fights Albino, black and hooded rats were selected for desirable traits In the 19th century albino rats were used for the first time in the laboratory for physiological studies Wistar Institute of Anatomy and Biology is responsible for most of the Wistar and Sprague-Dawley rats throughout the world
9 Why are rodents use in biomedical research? easy to keep and handle small and inexpensive high reproductive capacity short generation time and lifespan large number of strains and stocks for traditional laboratory rodents Lagomorphs Lagomorphs were previously classified as rodents, but in 1951 moved to their own order Lagomorpha
10 Taxonomy of lagomorphs Class: Mammalia Order: Lagomorpha (lagomorphs) Family: Leporidae (rabbits and hares) Genus: Oryctolagus (Rabbits) Species: Oryctolagus cuniculus Linnaeus, 1758 (European rabbit) The rabbit
11 Rabbit origin The rabbit is native to western Europa and northwest Africa The species was domesticated already in Roman times in Italy and Northern Africa Today we know more then 50 races of domestic rabbit, originating from one species Rabbit behavior Rabbit are generally timid and nonagressive Rabbits are gregarious animals Rabbits are nocturnal All rabbit have en escape instinct
12 Rabbit digestive system Coprophagous They eat moist fecal pellets produced at night Feces, rich in vitamins and protein, are consumed directly from anus The cecum is very large Rabbit breeding Lifespan is 5-6 years Rabbits are induced ovulators with ova released hours following copulation Average gestation is 32 days The average litter size is 7-8 The young weigh g at birth Cannibalism is rare
13 Rabbit as laboratory animal Because of size, rabbits are used in surgical research They are used in production of polyclonal antibodies and pyrogen testing Nomenclature of laboratory rats and mice is authorized by: International Rat Genetic Nomenclature Committee International Committee on Standardized Nomenclature for Mice
14 Every approved breeder is coded in the nomenclature s abbreviation Outbred stocks: HanTac:WH NTac:SD Inbread strains: BALB/cJBomTac LE/HanMolTac Substrains: DBA/1J DBA/2J Useful links Institute for Laboratory Research Nomenclature rule for rats and mice Taconic M&B AS Laboratory animal department (Vivarium, BBB, Gade)
15 Housing of rodents Rodent husbandry A wide variety of cages is available for rodents The size and height of the cages used for each rodent species is regulated by recommendations of the European Convention Plastic in the form of macrolon is the most often used cage material
16 Rodent bedding and food The bedding must be absorptive Food is supplied in the form of pellets Aspen shaving is use in our department Both food and bedding are certified to be free of chemical and microbial contaminants For rats and mice MR1 (Rat and Mouse nr. 1 Maintenance) from Special Diet Service is used The rat
17 The mouse Macrolon cages type IV
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Mus musculus More laboratory mice are used in research every yyear than any other animal species.
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