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Journal of Dairy Science Vol. 49 No. 2 209-211
© 1966 by American Dairy Science Association ®
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Does a Diurnal Rhythm of Thyroid Activity Exist in Dairy Cattle?1

M. K. Yousef and H. D. Johnson

Dairy Husbandry Department University of Missouri, Columbia

ABSTRACT

The diurnal rhythm of thyroid activity in Holstein cows was studied, using two parameters of the thyroid activity. The thyroxine I131 disappearance rate and plasma PBI data indicated the absence of any diurnal rhythm effects on thyroid activity under controlled conditions. The results suggested the validity of the daily thyroxine I131 disappearance rate in estimating the daily thyroxine secretion rate and the validity of the PBI determination of blood collected at any time during the day or night.

FOOTNOTES

1 Contribution from Missouri Agricultural Experiment Station. Approved by the Director. Journal Series no. 3027.






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Copyright © 1966 by the American Dairy Science Association ®.