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Proceedings: The transport of spermatozoa in ewes treated with steriod hormones.


 The report cites the results of three experiments designed to determine the effect of estrogen treatment on spayed and entire ewes. In the spayed ewes, estrus was induced by progesterone priming followed by an injection of estroidal benzoate. Measurements at the twelth hour showed a far greater accumulation of spermatozoa in the mid and cranial cervix with dosages of 90 mcg than with 30 mcg. At the 24 hour mark, no measurable difference occurred. In the entire ewes, estrus was controlled using progestagen-impregnated sponges with subsequent administration of 1 mcg or 5 mcg/day of estradiol-17beta. At the 2 hour mark, little effect was observed in the number of spermatozoa entering the caudal cervix though a marked effect was found in the number traversing the cervix into the uterus. At 24 hours, there were no differences between estrogen treated and non-treated ewes in the cervix and uterus. The numbers in the fallopian tubes reflected the numbers found in the uterus and cranial cervix at the 2 hour mark. Estrogen treatment markedly reduced these numbers. Entire ewes also received 25 mcg/day estrogen during the normal luteal cycle. At 2 hours, there was no measurable effect in the caudal cervix but numbers were reduced in the mid and cranial cervix. At 24 hours, numbers in the fallopian tubes reflected this result. The report concludes that the sub-fertility in ewes is mostly due to changes in the cervical environment following estrogen treatment during the progestational phase, resulting in impaired transport of spermatozoa to the uterus.
