J. Anim Sci.
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J. Anim Sci. 1973. 37:957-961.
© 1973 American Society of Animal Science
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Route of Progestagen Administration to the Ewe and Spermicidal Action in the Vagina at the Ensuing Estrus

H. W. Hawk and H. H. Conley

U.S. Department of Agriculture1

Abstract

Parous ewes were treated orally with medroxyprogesterone acetate (MAP) or melengestrol acetate (MGA), subcutaneously with progesterone, or intra-vaginally with MAP, MGA or progesterone. Treatment was begun on day 8 of an estrous cycle and continued for 17 days. When the ewes were in estrus after progestagen withdrawal, they were inseminated artifically and their vulvo-vaginal junctions were ligated to prevent sperm cell drainage to the exterior. The ewes were killed 22 hrs later, their vaginas flushed, and intact sperm cells and tailless sperm heads counted.

The oral, subcutaneous or intravaginal administration of progestagen increased the numbers of sperm cells recovered as tailless heads, indicating stimulation of sperm-breaking mechanisms in the vagina at the ensuing estrus. Progestagen given intravaginally decreased the total number of sperm cells recovered, indicating increased sperm cell disappearance within the vagina.

Footnotes

1 Animal Physiology and Genetics Institute, A.R.S., Agricultural Research Center, Beltsville, Maryland 20705. The authors express appreciation to Dr. R. G. Zimbelman, The Upjohn Company, Kalamazoo, Michigan, for supplying the synthetic progestagens.

Mention of products or companies in the report does not constitute endorsement by the U.S. Department of Agriculture to the exclusion of others not mentioned.






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Copyright © 1973 by the American Society of Animal Science.