J. Anim Sci.
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J. Anim Sci. 1962. 21:700-705.
© 1962 American Society of Animal Science
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Effect of Ambient Temperature and Thyroxine Therapy on Semen Quality of Rams1

Jerry R. Brooks and C. V. Ross2

University of Missouri, Columbia

Abstract

Four trials were conducted to determine the influence of the thyroid gland upon the apparent fertility of mature rams. The tests were designed to investigate the semen quality of Hampshire rams receiving thyroxine therapy under two levels of ambient temperature.

The results of the four trials established that L-thyroxine injected daily at levels of either 0.2, 0.3, or 0.4 mg. per 100 lb. body weight had no significant effect upon semen quality. However, there appeared to be a lowering of semen quality associated with thyroxine therapy at higher environmental temperatures.

It was further observed that ambient temperatures of approximately 80° F. apparently constituted a critical point above which semen quality declined.

Footnotes

1 Contribution from Missouri Agricultural Experiment Station, Journal Series Number 2400. Approved by the Director.

2 Department of Animal Husbandry.






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Copyright © 1962 by the American Society of Animal Science.