Female Uganda kob antelope conceive while lactating maximally and may continue lactating to 180 days of pregnancy. Udders of lactating females exceed 450 g in weight; in non-lactating adults, udders weigh < 300 g. The uterus is grossly involuted by 20 to 30 dayspost partum, declining from about 1000 g to < 100 g. Immature ovarian follicles of 2 to 5 mm diameter occur at about the same rate both in pregnant and non-pregnant adults. Mature follicles >5 mm in diameter are absent in the last 60 days of gestation and are rare in the first 20 days post partum. Follicles in oestrous females become >8 mm, increasing to 11 mm at ovulation which may commence at about 10 days post partum. Some females may conceive at this time. Seven females conceived at < 65 days post partum. Post partum females commonly have up to four or five oestrous cycles before conception. Many oestrous periods recur at 6-to 13-day intervals and are accompanied by ovulations resulting in accumulations of small cl which begin to regress before reaching maturity. These brief dioestrous intervals are thought to result from premature regression of cyclic cl brought on by increased secretion of oxytocin induced by various sensory stimuli associated with the territorial mating grounds to which oestrous females go to mate.
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