The rate of establishment of a population of viable spermatozoa in the oviducts was studied using a technique of post-coital transection in conjunction with subsequent examination of the proportion of eggs fertilized. Gilts were mated early in oestrus before ovulation or on the 2nd day of oestrus after ovulation , and 30, 45 or 60 min later the reproductive tract was sectioned just above or below the utero-tubal junction in a total of 48 animals; these were slaughtered 1 or 2 days after the operation. Mean percentage fertilization increased overall a with the time elapsing from mating to transection, b with transection below the utero-tubal junction compared with in the caudal isthmus, and c with a post-ovulatory versus pre-ovulatory mating. In a further 6 gilts, the results of transection in the lower third of the oviduct 3 h after mating at the onset of oestrus indicated that spermatozoa were initially sequestered in the caudal portion of the isthmus.
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In species where females mate with multiple males, the sperm from these males must compete to fertilise available ova. Sexual selection from sperm competition is expected to favor opposing adaptations in males that function either in the avoidance of sperm competition by guarding females from rival males or in the engagement in sperm competition by increased expenditure on the ejaculate. The extent to which males may adjust the relative use of these opposing tactics has been relatively neglected.
There is a new focus on rabbits in terms of their so called prolific breeding rate, huge demand for rabbit meat production globally, but also ethical issues in terms of animal experimentation in medical research. Hares and rabbits are in the same family, Leporidae , but are otherwise quite different from each other. Gestation in hares is 42 days and only about 30 days in rabbits.