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Biology of Reproduction, Vol 24, 1026-1031, Copyright © 1981 by Society for the Study of Reproduction

Effects of Daily Administration of Estradiol-17beta on Follicular Growth, Ovulation, and Plasma Hormones in Mares

P. J. BURNS 1, and R. H. DOUGLAS 1

1 Department of Veterinary Science, University of Kentucky, Lexington, Kentucky 40546


Follicular growth and concentrations of circulating progesterone (P4), FSH, and LH were measured in horse mares treated daily with estradiol-17beta (E2). Treatment of mares with 10 mg E2 from Days 1 to 31 postovulation had no significant effect on luteal life span, while it significantly prolonged the length of estrus and the interovulatory interval (IOI), and suppressed follicular development and ovulation. E2 treatment had no significant effect on baseline LH concentrations in the presence of a functional corpus luteum (CL); however, E2 was able to stimulate LH secretion for up to 2 weeks after CL regression. Mares in the control group of this study exhibited a bimodal pattern of FSH secretion, while treatment of mares with E2 altered the pattern of FSH secretion by suppressing FSH concentrations during early diestrus.

Note:
ACKNOWLEDGMENTS The investigation reported in this paper (No. 80-4-290) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director. It was supported in part by a grant from The Grayson Foundation, Inc. Antiserum to human FSH, used in the equine FSH assay, was donated by NIAMDD. Dr. 0. J. Ginther generously supplied the anti-PMSG antiserum and purified equine FSH and LH for standards and iodination. The authors wish to express their appreciation to Mr. K. Hollon, Mr. J. Fay, Ms. H. Willard, and Mrs. L. Garrison for their assistance in this project.

Submitted on December 24, 1980
Accepted on February 12, 1981




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O.J Ginther, M.D Utt, M.A Beg, E.L Gastal, and M.O Gastal
Negative Effect of Estradiol on Luteinizing Hormone Throughout the Ovulatory Luteinizing Hormone Surge in Mares
Biol Reprod, September 1, 2007; 77(3): 543 - 550.
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Copyright © 1981 by the Society for the Study of Reproduction.