Effect of 17β-Estradiol on Pituitary Gonadotropins and Luteal Function in Gilts

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Abstract
Pituitary gonadotropin content and ovarian characteristics were studied following daily intramuscular injection of gilts with 7 mg of 17²-estradiol from day 11 through 16 of the estrous cycle (first day of estrus=day 1 of the cycle). Control and treated gilts were autopsied on day 17 of the cycle. Estradiol caused an increase in pituitary FSH and LH activity (P<.01, for each gonadotropin) and also increased anterior pituitary dry weight (P<.05). Treatment of gilts with estradiol inhibited ovarian follicular growth beyond 5 mm in diameter, reduced the number of follicles ⩾3 mm in diameter (P<.01) and depressed follicular fluid weight (P<.01). Injection of estradiol into gilts was without effect on luteal weight, but increased luteal progesterone content and concentration (P<.01, for each characteristic). Copyright © 1972. American Society of Animal Science. Copyright 1972 by American Society of Animal Science.

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