J. Anim Sci.
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J. Anim Sci. 1957. 16:967-975.
© 1957 American Society of Animal Science
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The Effect of Progesterone on the Estrous Response of Estrogen-Conditioned Ovariectomized Cows1

R. M. Melampy, M. A. Emmerson, J. M. Rakes, L. J. Hanka and P. G. Eness

Iowa State College2

Abstract

Progesterone can induce estrous behavior, including sexual receptivity in the estrogen-conditioned ovariectomized cow. Maximal synergistic action of progesterone was observed when this hormone was injected 12 hours before, simultaneously with, or 12 hours following a conditioning level of estrogen. It is suggested that after conditioning with female sex hormone, normal sexual receptivity in the cow may be caused by the action of progesterone produced during the period of the pre-ovulatory development of the Graafian follicle.

Progesterone in large doses can antagonize the estrous behavior response in ovariectomized cows injected with a level of estrogen which would otherwise induce sexual receptivity. Estrogen-treated cows injected with 30 mg. or more of progesterone failed to show signs of estrus.

Desoxycorticosterone acetate and testosterone propionate both show a synergistic action in estrogen-conditioned ovariectomized cows. Other steroids may be effective in the mating behavior of the cow.

Footnotes

1 Journal Paper No. J-3115 of Iowa Agr. Exp. Station. Ames, Iowa. Project No. 1325. Acknowledgement is made of research grant C-1779(C3), National Cancer Institute of U.S.P.H.S., Department of Health, Education and Welfare. Suggestions made by Professors S. A. Asdell and W. Hansel, Cornell University are acknowledged.

2 Departments of Animal Husbandry, Veterinary Obstetrics and Radiology.






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Copyright © 1957 by the American Society of Animal Science.