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When hamsters mate shortly after the onset of oestrus (4\ m=. \ 5\ p=n-\ 6 h before the onset of ovulation), spermatozoa are stored in the caudal isthmus of the oviduct until near the time of ovulation. At this time, a few spermatozoa ascend to the ampulla to fertilize the eggs. Superovulation resulted in a significant increase in the number of spermatozoa in the caudal isthmus at 6 h post coitus (p.c.) and in the ampulla and bursal cavity at 12 h p.c. Precocious ovulation resulted in a highlydoi:10.1530/jrf.0.0930157 pmid:1920285 fatcat:h76k7e6kzvff3lzf62d3pssou4