Influence of Ovarian Hormones on Sperm 'Breakage' and Disappearance in Sheep Uteri

Hw, Hawk; Bs, Cooper

doi:10.1530/jrf.0.0270349

Cited by 5 publications

(2 citation statements)

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“…Since oestrogen increases and progesterone decreases sperm breakage in the sheep uterus (Hawk & Cooper, 1971), it seems unlikely that any lingering effects of progestagen from the sponges of the present experiment would in¬ tensify sperm breakage by direct action on the reproductive tract. Rather, the increased sperm breakage in regulated ewes would be consistent with the possibility that the reproductive tracts of these ewes were under greater oestrogenic influences than were the tracts of ewes in cyclic oestrus.…”

Section: Sperm Cell Losses In Regulated Ewesmentioning

confidence: 73%

“…Chang (1956) and Moyer, Legoretta, Maruta & Henderson (1967) found large numbers of tailless sperm heads in rabbit uteri after depositing semen in the uterus, and Blandau & Odor (1949) and Ericsson & Baker (1966) found broken sperm cells in the reproductive tracts of the rat. In the sheep uterus, the breakage of sperm cells was increased by endogenous or exogenous oestrogen and by the presence of a plastic spiral in the uterine lumen; sperm breakage was decreased by endogenous or exogenous progesterone (Conley & Hawk, 1970;Hawk & Cooper, 1971).…”

Section: Sperm Cell Losses By Drainage Breakage and Disappearancementioning

confidence: 99%

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Loss of Spermatozoa From the Reproductive Tract of the Ewe and Intensification of Sperm 'Breakage' by Progestagen

Hw¹,

Hh²

1971

Reproduction

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Sponges impregnated with medroxyprogesterone acetate (MAP) were left in the vaginae of parous ewes from 8 to 25 days after oestrus. The ewes were inseminated with 0\m=.\25ml of fresh ram semen 45 hr after removal of the sponges. Ewes in natural oestrus were inseminated as controls. In half of the ewes of each group, the reproductive tract was ligated at the vulvovaginal junction at the time of insemination to prevent the loss of sperm cells by drainage. Ewes were killed 24 hr after insemination and the number of spermatozoa in each segment of the reproductive tract was estimated.While 62 % of the spermatozoa were recovered from ewes in which the vulvovaginal junction was ligated, less than 1 % were recovered from the ewes with unligated tracts, indicating the loss of large numbers of sperm cells by drainage. Fewer spermatozoa and a higher proportion of tailless sperm heads were recovered from ewes treated with MAP than from control ewes.

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Section: Sperm Cell Losses In Regulated Ewesmentioning

confidence: 73%