Effect of ovulation on sperm transport in the hamster oviduct

M. Ito, T. T. Smith, R. Yanagimachi
1991 Reproduction  
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 highly
more » ... sulted in a highly significant reduction in the total number of spermatozoa in the oviduct at 3 and 6 h p.c. This effect was completely overcome by intrauterine artificial insemination, suggesting lack of cervical patency as the block to sperm transport in precociously ovulated animals. Ligation of the ampulla\p=n-\infundibulumjunction in naturally ovulating hamsters resulted in significantly fewer spermatozoa in the caudal isthmus and ampulla at 12 h p.c. Preclusion of ovulation also resulted in fewer spermatozoa in the caudal isthmus and ampulla at 12 h p.c., suggesting that the products of ovulation stimulate sperm transport in the oviduct.
doi:10.1530/jrf.0.0930157 pmid:1920285 fatcat:h76k7e6kzvff3lzf62d3pssou4