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Estrus and LH Release in Ovariectomized Heifers following Vaginal Devices Containing Ovarian Steriods^{1 ,5,}

Macdonald Campus of McGill University^,4, Ste. Anne de Bellevue, Quebec HOA 1CO

Abstract

An experiment was conducted to study the effects of Silastic vaginal devices containing either estradiol-17ß, progesterone or progesterone + estradiol-17ß on estrus and luteinizing hormone (LH release in ovariectomized heifers. All heifers treated with a vaginal device that contained estradiol-17ß exhibited estrus and LH release, whereas none of those treated with devices that contained progesterone + estradiol-17ß exhibited estrus or LH release. This experiment demonstrates that progesterone blocks estrogen-induced estrus and LH release in ovariectomized heifers.

¹ This study was supported financially by Quebec Agriculture Research Council Grant No. McA-75-595.

⁵ The authors thank Dr. G. D. Niswender (Colorado State Univ.) for the anti-estradiol-6-BSA serum.

² Present address: Lecturer, Department of Animal Husbandry, Univ. of Sri-Lanka, Peradeniya, Sri-Lanka.

³ Present address: American Embryos, Inc., 2220 Patterson Road, Middleville, MI 49333.

⁴ Department of Animal Science.