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| − | == Male ==
| + | <big><center>[[Reproductive System|'''BACK TO REPRODUCTIVE SYSTEM''']]</center></big> |
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| − | Anogenital distance in the adult is ~10mm (twice that of the female).
| + | <big><center>[[Reproductive_System#Small_Domestic_Mammals|'''BACK TO SMALL DOMESTIC MAMMALS''']]</center></big> |
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| − | === Penis ===
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| − | * Os penis lies within the tissue of the penis.
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| − | === Testes === | + | == Male == |
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| − | * Two testes in an external scrotum.
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| − | * Testes descend at 30-40 days.
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| | * Active spermiogenesis and mating apparent from 10 weeks of age. | | * Active spermiogenesis and mating apparent from 10 weeks of age. |
| | + | * Anogenital distance in the adult is ~10mm (twice that of the female). |
| | * In the young animal, scrotum is obvious and dark in colour. | | * In the young animal, scrotum is obvious and dark in colour. |
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| − | === Reproductive Behaviour ===
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| | * Abdominal sebacious gland is large and apparent at ~4 weeks. | | * Abdominal sebacious gland is large and apparent at ~4 weeks. |
| − | ** Rubbed along the ground to mark territorial boundaries.
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| − | * Form monogamous pairs/Harems
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| − | ** Fighting among males is common
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| − | === Mammary Gland===
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| − | * Teats are absent.
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| | == Female == | | == Female == |
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| − | === Reproductive Tract ===
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| − | * [[Uterus - Anatomy & Physiology#Anatomical_Types_of_Uteri|Bicornuate uterus]]
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| − | * Two channels of the [[Cervix - Anatomy & Physiology|cervix]] separated almost to the single entrance into the [[Vagina and Vestibule - Anatomy & Physiology|vagina]].
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| − | === Puberty and Sexual Maturity ===
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| − | * Sexual maturity is at ~9-12 weeks.
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| − | === Oestrous Cyclicity ===
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| − | * Polyoestrous
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| − | * [[Oestrous Cycle - Anatomy & Physiology|Oestrous cycle]] length: 4-6 days
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| − | * Post-parturient oestrus
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| − | * Spontaneous [[Ovulation - Anatomy & Physiology|ovulator]].
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| − | === Breeding Characteristics ===
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| − | * Monogamous (in contrast to [[Rat Reproduction - Anatomy & Physiology|rats]] and [[Mouse Reproduction - Anatomy & Physiology|mice]]).
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| − | * Mating usually occurs in the evening.
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| − | * Copulation plug is small and lies deep in the [[Vagina and Vestibule - Anatomy & Physiology|vagina]], so cannot easily be detected.
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| − | === Gestation and Offspring===
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| − | ==== Gestation ====
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| − | * Gestation period is 22-26 days.
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| − | * May produce a litter every 30-40 days and can produce a total of 10 litters.
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| − | * Maximum breeding age is 20 months, but usually the time between the first and last litter is ~1 year.
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| − | * Pseudopregnancy may occur.
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| − | ==== Litter ====
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| − | * Mean litter size is 4-5.
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| − | * Altricial offspring.
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| − | ** Hairless, blind and virtually helpless.
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| − | ** Ears open at 5 days.
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| − | ** Eyes open at 16-17 days.
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| − | ** Cannibalisation/abandonment is rare.
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| − | === Mammary Gland ===
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| − | * 4 pairs of teats.
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| − | [[Category:Small Mammal Reproduction]]
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| − | [[Category:Bullet Points]]
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