J. Anim Sci.
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J. Anim Sci. 1985. 60:35-39.
© 1985 American Society of Animal Science
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Temporal Patterns of Growth Hormone in Blood and Seminal Plasma of Mature Dairy Bulls1,2,

S. L. Davis3,4,, P. L. Senger5, D. L. Ohlson2,3, and K. L. Hossner3

University of Idaho, Moscow 83843 and The Pennsylvania State University, University Park, PA 16802

Abstract

This study was conducted to determine if growth hormone (GH) concentration in bovine seminal plasma would be proportional to but less variable than blood plasma GH. The relationship between GH in blood and seminal plasma was also examined critically. Blood samples were collected at 15-min intervals for 5.75 h, while semen was collected at 30-min intervals over the same time period. Average seminal plasma GH concentrations were 3.2 times higher (P<.05) than blood plasma GH concentrations (40.4 ± 15.8 ng/ml vs 12.6 ± 1.2 ng/ml, respectively). The within animal correlation between blood and seminal plasma was consistently low and nonsignificant (P>.05). Overall blood plasma GH and seminal plasma GH concentrations were weakly correlated (r=D;.418; P>.05) among bulls. A predictable relationship between blood and seminal plasma GH concentration does not exist under the conditions of this study.

Footnotes

1 Idaho Agr. Exp. Sta. Pub. No. 83810.

2 We thank Atlantic Breeders Cooperative, Lancaster, PA, and Sire Power Inc., Tunkhannock, PA, for providing bulls for this study. Special appreciation is expressed to J. C. Hartle, E. H. Corl and R. R. Rimmey for skilled bull handling and sample collection. Thanks is also expressed to Dr. L. C. Griel, Jr. for installing the jugular catheters, to J. L. Peters and M. J. Briscoe for sample preparation, to Debbi Blann for expert technical assistance and Jim Wray for statistical advice and analysis.

3 Dept. of Anim. Sci.

4 Current address: Dept. Anim. Sci., Oregon State Univ., Corvallis, OR 97331-6702.

5 Dept. Dairy and Anim. Sci., Dairy Breeding Research Center.






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Copyright © 1985 by the American Society of Animal Science.