J. Anim Sci.
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J. Anim Sci. 1966. 25:1218-1226.
© 1966 American Society of Animal Science
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Symposium on Atomic Energy in Animal Science. II. Estimation of Carcass Lean Muscle Mass in Steers By K40 Measurement1, 2,

T. G. Lohman3, B. C. Breidenstein3, A. R. Twardock4, G. S. Smith3 and H. W. Norton3

University of Illinois, Urbana

Abstract

Results are presented from a study of 42 steers relating whole-body and carcass K40 contents, as measured by a large-volume, liquid scintillation counter, to carcass lean muscle mass as measured by chemical analysis. Variations in the amount of radioactivity of the gastrointestinal contents, in the counting efficiency of the whole-body counter and in the positioning of the steers with respect to the scintillation detector were found to be the main sources of error affecting the precision of estimated whole-body potassium and the precision with which the carcass lean muscle mass could be predicted. With procedures developed to account for, or minimize the above sources of variation, wholebody count was repeatable from day to day to within 2 or 3% in 21 steers and predicted carcass lean with standard errors of estimate less than 3% within two narrow weight ranges. Carcass K40 measurements predicted carcass lean with standard errors of estimate somewhat greater than the whole-body count (3.5%).

Body potassium can be measured precisely enough to suggest practical utility of the K40 method for determining carcass lean muscle mass in live steers and in steer carcasses.

Footnotes

1 Presented at the 56th Annual Meeting of the American Society of Animal Science, Knoxville, Tennessee.

2 This study was supported in part by grants from the Division of Biology and Medicine, United States Atomic Energy Commission; Illinois Department of Agriculture; and the National Livestock and Meat Board.

3 Department of Animal Science.

4 Department of Veterinary Physiology and Pharmacology.






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