Difference between revisions of "Gerbil Reproduction - Anatomy & Physiology"
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== Male == | == Male == | ||
+ | * Os penis lies within the tissue of the penis. | ||
+ | |||
+ | |||
+ | * Two testes in an external scrotum. | ||
* Testes descend at 30-40 days. | * Testes descend at 30-40 days. | ||
* Active spermiogenesis and mating apparent from 10 weeks of age. | * Active spermiogenesis and mating apparent from 10 weeks of age. |
Revision as of 12:15, 18 July 2008
Male
- Os penis lies within the tissue of the penis.
- Two testes in an external scrotum.
- Testes descend at 30-40 days.
- 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.
- Abdominal sebacious gland is large and apparent at ~4 weeks.
- Rubbed along the ground to mark territorial boundaries.
- Form monogamous pairs/Harems
- Fighting among males is common
- Teats are absent.
Female
- Bicornuate uterus
- Two channels of the cervix separated almost to the single entrance into the vagina.
- Polyoestrous
- Post-parturient oestrus
- Sexual maturity is at ~9-12 weeks.
- Monogamous (in contrast to rats and mice).
- Mating usually occurs in the evening.
- Copulation plug is small and lies deep in the vagina, so cannot easily be detected.
- Gestation period is 22-26 days.
- Mean litter size is 4-5.
- May produce a litter every 30-40 days and can produce a total of 10 litters.
- Maximum breeding age is 20 months, but usually the time between the first and last litter is ~1 year.
- Pseudopregnancy may occur.
- Altricial offspring.
- Hairless, blind and virtually helpless.
- Ears open at 5 days.
- Eyes open at 16-17 days.
- Cannibalisation/abandoment is rare.
- 4 pairs of teats.