J. Anim Sci.
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J. Anim Sci. 1971. 33:77-82.
© 1971 American Society of Animal Science
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Effect of a Progestin on the Bovine Ovary1

D. R. Lamond2, J. F. Dickey, D. M. Henricks, J. R. Hill, Jr. and T. M. Leland

Clemson University, 3 Clemson, South Carolina 29631

Abstract

Histological changes in the ovary, and changes in plasma progesterone during and after the period of treatment with the progestin, melengestrol acetate (MGA), were related to each other and to subsequent synchronization of estrus, and fertilization. Progesterone concentrations fluctuated during treatment and remained above normal after treatment. Heifers being treated with MGA had fewer normal growing follicles than controls but there was a rapid return to normal in most heifers after treatment ceased. Elevated levels of progesterone during progestin treatment were associated with hyperplasia of both the granulosa and theca interna in non-atretic follicles. Atretic follicles with proliferative theca were also observed.

Footnotes

1 Published with the approval of the Director of the South Carolina Experiment Station as Technical Contribution No. 888.

2 Present address: Department of Clinical Sciences, School of Veterinary Medicine, University of California, Davis, Calif. 95616.

3 Departments of Animal Science, Dairy Science and Food Science.






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Copyright © 1971 by the American Society of Animal Science.