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Biology of Reproduction, Vol 21, 1225-1229, Copyright © 1979 by Society for the Study of Reproduction

Cortisol Content of Semen and the Effect of Exogenous Cortisol on the Concentration of Cortisol and Minerals (Ca, Mg, K and Na) in Semen and Blood Plasma of Bulls

C. N. GRAVES 1, and H. EILER 2

1 Department of Dairy Science, University of Illinois, Urbana, Illinois, 61801
2 Department of Animal Science, Agricultural Experiment Station, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37901


The cortisol content of blood plasma and semen of bulls was less than 2.2 µg/100 ml and was not influenced by repetitive ejaculation. Within 40 min after injection of 500 mg cortisol i.v., the cortisol content of semen was similar to that of blood plasma indicating a rapid transfer of the cortisol into the reproductive tract secretions. Following cortisol administration, plasma levels of calcium and magnesium were increased, potassium was decreased and sodium remained unchanged. Semen mineral levels were not altered after cortisol injection.

Note:
ACKNOWLEDGMENTS This research was supported by Project H-515, Agricultural Experiment Station, University of Tennessee and Project 339, Agricultural Experiment Station, University of Illinois, The authors wish to thank Mr. W. A. Lyke, University of Tennessee, for his collaboration on the mineral analyses.

Submitted on July 23, 1979
Accepted on September 20, 1979






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Copyright © 1979 by the Society for the Study of Reproduction.