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Journal of Dairy Science Vol. 60 No. 4 632-634
© 1977 by American Dairy Science Association ®
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Luteinizing Hormone and Testosterone Concentrations in Plasma of Bull Calves Treated with Gonadotropin Releasing Hormone1

D. J. Kesler and H. A. Garverick

Department of Dairy Husbandry, University of Missouri, Columbia 65201

ABSTRACT

Twelve bull calves, 2 to 24 days of age, were assigned to two groups of six calves and administered a single 50 µg intramuscular injection of gonadotropin releasing hormone. Bull calves in group 1 were 2 to 5 days of age (mean 3.0 days), and bull calves in group 2 were 10 to 24 days of age (mean 17.1 days). Blood plasma for radioimmunoassay of luteinizing hormone and testosterone was collected at .5-h intervals for 3-h and at 4- and 6-h following treatment. With increasing age, preinjection luteinizing hormone concentrations in plasma decreased while preinjection testosterone concentrations increased. Mean preinjection luteinizing hormone concentrations for group 1 (1.01 ± .07 ng/ml; mean ± standard error) were higher than for group 2 (.61 ± .12 ng/ml). Preinjection luteinizing hormone and testosterone concentrations were correlated –.63. Following treatment, luteinizing hormone increased with mean peak concentrations of 7.28 ± .74 and 6.95 ± 1.79 ng/ml for groups 1 and 2. Peak testosterone response following gonadotropin releasing hormone was higher for group 2 than 1 (1077 ± 253 versus 436 ± 116pg/ml).

FOOTNOTES

1 Journal Paper No. 7697, Missouri Agricultural Experiment Station, University of Missouri-Columbia. Approved by the Director.






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Copyright © 1977 by the American Dairy Science Association ®.