J. Anim Sci.
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J. Anim Sci. 1981. 52:1437-1441.
© 1981 American Society of Animal Science
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Biological Detection of Heterozygosity for Double Muscling in Cattle II. Thyroid Hormone Concentrations1

J. E. Novakofski and R. G. Kauffman

University of Wisconsin, Madison 53706

Abstract

Serum levels of triiodothyronine and thyroxine were measured by radioimmunoassay to determine whether differences exist between double-muscled (DM) homozygous, DM heterozygous and non-DM cattle of beef and dairy origins. No differences in triiodothyronine concentrations were found between heterozygous and non-DM beef animals, but thyroxine concentrations in non-DM dairy cattle were significantly different from those in non-DM beef. Unexpectedly, hormone concentrations in DM homozygotes were lower than those in other genotypes.

Footnotes

1 This research was supported by the College of Agricultural and Life Sciences and in part by grants from the Frankenthal Foundation, Green Bay, WI, and the Ankony Angus Corp., Grand Junction, CO. Muscle Biology Paper No. 141.






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Copyright © 1981 by the American Society of Animal Science.