J. Anim Sci.
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J. Anim Sci. 1964. 23:28-31.
© 1964 American Society of Animal Science
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Effects of Temperature and Feed Intake on Thyroxine I131 Disappearance Rates of Cattle1

R. G. Lundgren and H. D. Johnson2

University of Missouri, Columbia

Abstract

Six lactating Holstein dairy cattle were used to determine the effects of environmental temperature and controlled feeding on the blood thyroxine I131 disappearance rates. Environmental temperature of 88° F. significantly depressed blood thyroxine I131 disappearance rates in ad libitum and control-fed animals. Temperature differences in the thyroxine I131 disappearance rate were greater (P<.10) for the controlled-fed animals than the ad libitum group. There was a highly significant difference in the thyroxine I131 disappearance rate due to environmental temperature for all animals.

These results suggest that thyroxine I131 disappearance rates are depressed directly by high environmental and body temperatures rather than by depressed feed intakes.

Footnotes

1 Missouri Agricultural Experiment Station Journal Series No. 2555.

2 Department of Dairy Husbandry.






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Copyright © 1964 by the American Society of Animal Science.