J. Anim Sci.
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J. Anim Sci. 1963. 22:476-480.
© 1963 American Society of Animal Science
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Effect of Season, Sex and Breed on the Thyroxine Secretion Rate of Beef Cattle and a Comparison with Dairy Cattle1,2,

G. W. Pipes, T. R. Bauman, J. R. Brooks, J. E. Comfort and C. W. Turner

Departments of Dairy and Animal Husbandry, University of Missouri, Columbia

Abstract

Two hundred ninety-six observations of the thyroxine secretion rate (TSR) were made on 68 heifers, 33 steers and 74 bulls of the Angus, Shorthorn and Hereford breeds during various months of the year. No significant differences were found due to sex, castration, breed, or season. Individual variations ranged from 0.1 to 0.7 mg. of 1-thyroxine, while the mean TSR was 0.27±.006 mg. per 100 lb. body weight. This value is significantly lower than that reported for dairy cattle (0.40±.013).

Footnotes

1 Contribution from Missouri Agricultural Experiment Station. Journal Series No. 2508. Approved by the Director.

2 Aided in part by a grant from U. S. Atomic Energy Commission, Contract No. AT(11-1) 301.






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Copyright © 1963 by the American Society of Animal Science.