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 Reproduction

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meodingu
Kig 'Yar
Kig 'Yar


Male
Number of posts : 141
Age : 31
Registration date : 2010-10-13

PostSubject: Reproduction   Mon Oct 18, 2010 5:44 am

Reproduction

Pups that are just a day old

Breeding onset is at about 50 days of age in both females and males, although females may have their first estrus at 2540 days. Mice are polyestrous and breed year round; ovulation is spontaneous. The duration of the estrous cycle is 45 days and estrus itself lasts about 12 hours, occurring in the evening. Vaginal smears are useful in timed matings to determine the stage of the estrous cycle. Mating is usually nocturnal and may be confirmed by the presence of a copulatory plug in the vagina up to 24 hours post-copulation. The presence of sperm on a vaginal smear is also a reliable indicator of mating.[4]

Female mice housed together tend to go into anestrus and do not cycle. If exposed to a male mouse or the pheromones of a male mouse, most of the females will go into estrus in about 72 hours. This synchronization of the estrous cycle is known as the Whitten effect. The exposure of a recently bred mouse to the pheromones of a strange male mouse may prevent implantation (or pseudopregnancy), a phenomenon known as the Bruce effect.[4]

The average gestation period is 20 days. A fertile postpartum estrus occurs 1424 hours following parturition, and simultaneous lactation and gestation prolongs gestation 310 days owing to delayed implantation. The average litter size is 1012 during optimum production, but is highly strain dependent. As a general rule, inbred mice tend to have longer gestation periods and smaller litters than outbred and hybrid mice. The young are called pups and weigh 0.51.5 g (0.0180.053 oz) at birth, are hairless, and have closed eyelids and ears. Cannibalism is uncommon, but females should not be disturbed during parturition and for at least 2 days postpartum. Pups are weaned at 3 weeks of age; weaning weight is 1012 g (0.350.42 oz). If the postpartum estrus is not utilized, the female resumes cycling 25 days postweaning.[4]

Newborn male mice are distinguished from newborn females by noting the greater anogenital distance and larger genital papilla in the male. This is best accomplished by lifting the tails of littermates and comparing perineums.[4]



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