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Journal of Dairy Science Vol. 64 No. 7 1618-1620
© 1981 by American Dairy Science Association ®
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Postpartum Concentrations of Thyroxine in Plasma of Dairy Cows

D. J. Kesler, H. D. Johnson and H. A. Garverick

Department of Animal Science, University of Illinois, Urbana 61801
Department of Dairy Husbandry, University of Missouri, Columbia 65201

ABSTRACT

Concentrations of thyroxine in blood plasma were measured by radioimmunoassay in 32 dairy cows postpartum and during estrous cycles. Mean concentrations of thyroxine declined from 1 to 2 days postpartum to 5 or 6 days postpartum. Concentrations of thyroxine remained low at 7 to 10 days postpartum and during the first estrous cycle. During subsequent estrous cycles concentrations of thyroxine were elevated to those 1 or 2 days postpartum.






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Copyright © 1981 by the American Dairy Science Association ®.