J. Anim Sci.
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J. Anim Sci. 1977. 44:1030-1035.
© 1977 American Society of Animal Science
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Testosterone Treatment of Cows for Use in Detection of Estrus1

T. E. Kiser2, J. H. Britt2 and H. D. Ritchie3

Michigan State University, East Lansing 48824

Abstract

Angus-Holstein cows were given testosterone or testosterone propionate for 20 days (induction regime) and then testosterone enanthate every 10 to 14 days (maintenance regime) to increase mounting behavior. Induction treatments given as intravaginal coils (185 cm2 exposed surface) covered with polydimethylsiloxane impregnated with 3 to 5 g of testosterone, testosterone (200 mg) impregnated polyurethane foam pessaries or intramuscular injections of testosterone propionate (200 mg on alternate days) resulted in similar increases in blood serum concentrations of testosterone. Subcutaneous administration of .5 or 1 g testosterone enanthate caused prolonged elevation of testosterone concentrations in blood during the maintenance regime. Testosterone-treated cows, fitted with marking devices, detected cows in estrus that were not observed by the herdsman. First insemination conception rate was not significantly different when estrus was detected from ink markings over the rump area or observed by the herdsman. In addition testosterone-treated cows were as effective as surgically altered bulls for detection of estrus. These data suggest that testosterone-treated cows are an aid for detection of estrus in beef cows.

Footnotes

1 Published with approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 7699. This research was supported in part by a grant from National Association of Animal Breeders. Appreciation is expressed to Dr. B. E. Seguin, Dr. R. A. Welch, Mr. W. T. Britt, Mr. D. L. Nielsen, Mr. C. E. Buehrly and Mr. D. J. Hunt for their help in executing the study.

2 Department of Dairy Science.

2 Department of Dairy Husbandry.






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Copyright © 1977 by the American Society of Animal Science.