Enhancement by Exogenous Estradiol of Uterine Motility in Estrous Ewes

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Abstract
Uterine contractions were observed in 90 estrous ewes in an experiment of 3 × 2 × 3 factorial design. Ewes were in normal unregulated estrus or in prostaglandin or progestogen regulated estrus; one-half of the ewes of each group were treated after the beginning of estrus with 30 µg of estradiol-17β; uterine contractions were observed at 24, 36 or 48 hr after the beginning of estrus. Ewes were laparotomized, and the uterus was exposed and observed for 10 minutes. At each of the three time intervals, treatment of ewes with estradiol increased the total number of contractions and the number of contractions moving toward to oviducts. The estradiol treatment decreased the number of contractions moving toward the cervix at 24 and 48 hours. The total number of contractions averaged 68 per 10 min for all estradiol treated ewes and 45 for all ewes not treated with estradiol. There were no major effects of prior treatment with prostaglandin or progestogen on the uterine response to estradiol. Copyright © 1975. American Society of Animal Science. Copyright 1975 by American Society of Animal Science.

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