J. Anim Sci.
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J. Anim Sci. 1971. 33:623-628.
© 1971 American Society of Animal Science
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Hormonal Control of Reproductive Activity in Karakul Ewes1, 2,

N. Sefidbakht, M. Makarechian and K. Ghorban

Pahlavi University, Shiraz, Iran3

Abstract

Considerable work to increase efficieny of production in sheep has been done through the development of hormonal control of the estrous cycle and in induction of fertile estrus in the anestrous ewe. Two injections of pregnant mare serum (PMS) at one estrous cycle interval either or both preceded by progestogen priming have been shown to increase fertility in the lactating and dry antestrous ewes (Gordon, 1963; Brunner, Hansel and Houge, 1964; Wagner, 1964; Roberts and Edgar, 1966; Hulet and Foote, 1967).

The first part of this paper presents data concerning the effects of 6-Chloro-6-17 acetoxyprogesterone (CAP) with and without estradiol 17-ß on estrus and fertility in cycling Karakul ewes. The second part presents studies which were designed to investigate the interaction between three hormone progesterone, estradiol 17-ß and PMS on estrus and fertility in lactating, anestrous ewes.

Trial I. One-hundred-ninety-six 2- to 7-year-old Karakul dry ewes from the flock of Animal Experiment station, Ministry of Agriculture were randomly selected on August 6, 1967.

Footnotes

1 The advice, encouragement and cooperation of Dr. W. C. Foote is gratefully acknowledged.

2 Supported in part by Pahlavi University, Central Research Fund; and by the Eli LIlly Company, Greenfield, Indiana and Animal Experiment Station, Ministry of Agriculture, Shiraz, Iran.

3 Department of Animal Science






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Copyright © 1971 by the American Society of Animal Science.