Difference between revisions of "Rat Reproduction - Anatomy & Physiology"
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− | + | <big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big> | |
− | ===Penis | + | <big><center>[[Reproductive_System#Small_Domestic_Mammals|'''BACK TO SMALL DOMESTIC MAMMALS''']]</center></big> |
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+ | = Male = | ||
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+ | == Penis == | ||
* Penis is easily extruded from the prepuce. | * Penis is easily extruded from the prepuce. | ||
* Os penis lies within the tissue of the penis. | * Os penis lies within the tissue of the penis. | ||
− | + | == Testes == | |
* Two testes in an external scrotum. | * Two testes in an external scrotum. | ||
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* Head and tail of the epididymis are the sites of extremely large fat pads. | * Head and tail of the epididymis are the sites of extremely large fat pads. | ||
− | == | + | == Puberty and Sexual Maturity == |
− | + | * Sexually mature at 6-8 weeks | |
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− | + | == Mammary Gland == | |
* Teats are absent. | * Teats are absent. | ||
− | + | ---- | |
− | = | + | = Female = |
− | == | + | == Reproductive tract == |
− | * | + | * [[Female_Reproductive_Tract_-The_Uterus_-_Anatomy_%26_Physiology#Anatomical_Types_of_Uteri|Bicornate uterus]] |
− | * | + | ** Short uterine body |
− | ** | + | ** Single [[Female_Reproductive_Tract_-The_Cervix_-_Anatomy_%26_Physiology|cervix]] |
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− | + | == Oestrous Cyclicity == | |
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* Non-seasonal polyoestrus | * Non-seasonal polyoestrus | ||
− | * | + | * [[Female_Reproductive_Tract_-Oestrous_Cycle_-_Anatomy_%26_Physiology|Oestrus cycle]] 4-5 days. |
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* Duration of oestrus is ~14 hours. | * Duration of oestrus is ~14 hours. | ||
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− | == | + | == Copulation == |
− | * | + | * Evidence that mating has occured is the 'copulatory plug' |
− | * | + | ** Forms in the vagina. |
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+ | == Gestation and Offspring == | ||
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+ | * [[Reproductive_System#Gestation|Gestation]] length is 20-22 days. | ||
* Litter size 6-16 | * Litter size 6-16 | ||
* Altricial young | * Altricial young | ||
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* Care not to stress mother or she may cannibalise the young. | * Care not to stress mother or she may cannibalise the young. | ||
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+ | == Mammary Gland == | ||
− | + | * 5 pairs of teats. |
Revision as of 13:53, 22 July 2008
Male
Penis
- Penis is easily extruded from the prepuce.
- Os penis lies within the tissue of the penis.
Testes
- Two testes in an external scrotum.
- Testes descend between day 30-40.
- Open inguinal canals throughout life.
- Allows the testes to shrink and return to the abdomen during the non-breeding season.
- Head and tail of the epididymis are the sites of extremely large fat pads.
Puberty and Sexual Maturity
- Sexually mature at 6-8 weeks
Mammary Gland
- Teats are absent.
Female
Reproductive tract
- Bicornate uterus
- Short uterine body
- Single cervix
Oestrous Cyclicity
- Non-seasonal polyoestrus
- Oestrus cycle 4-5 days.
- Duration of oestrus is ~14 hours.
Copulation
- Evidence that mating has occured is the 'copulatory plug'
- Forms in the vagina.
Gestation and Offspring
- Gestation length is 20-22 days.
- Litter size 6-16
- Altricial young
- Eyes open at 12-14 days.
- Earliest weaning age 21 days.
- Care not to stress mother or she may cannibalise the young.
Mammary Gland
- 5 pairs of teats.