J. Anim Sci.
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J. Anim Sci. 1972. 34:427-429.
© 1972 American Society of Animal Science
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Effect of 17ß-Estradiol on Pituitary Gonadotropins and Luteal Function in Gilts1

P. K. Chakraborty, D. C. England and F. Stormshak2

Oregon State University, Corvallis 97331

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).

Footnotes

1 Technical paper No. 3126, Oregon Agricultural Experiment Station.

2 Department of Animal Science.






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Copyright © 1972 by the American Society of Animal Science.