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Journal of Dairy Science Vol. 72 No. 1 202-207
© 1989 by American Dairy Science Association ®
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Effect of Treatment with Progesterone on Pregnancy Rate and Plasma Concentrations of Progesterone in Holstein Cows

Nancy A. Robinson1, Kenneth E. Leslie2 and John S. Walton1

University of Guelph, Guelph, Ontario N1G 2W1 Canada

ABSTRACT

Progesterone-releasing intravaginal devices inserted into the vaginas of dairy cows between d 5 to 12 (n = 28) or d 10 to 17 (n = 27) after insemination increased pregnancy rate to 60 over 30% in untreated control cows (n = 30). Plasma progesterone concentrations were increased during both progesterone treatments. Subtraction of the estimated contribution of exogenous progesterone indicated that endogenous, luteal progesterone was reduced during d 10 to 17 but not during d 5 to 12. Supplemental progesterone increased pregnancy rate but suppressed endogenous production of progesterone when administered during d 10 to 17 after insemination.

FOOTNOTES

1 Department of Animal and Poultry Science.

2 Department of Population Medicine.




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Copyright © 1989 by the American Dairy Science Association ®.