J. Anim Sci.
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J. Anim Sci. 1976. 42:352-356.
© 1976 American Society of Animal Science
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Determination of Body Composition of Steers by 40K1

J. L. Clark, H. B. Hedrick2 and G. B. Thompson

University of Missouri3, 4,, Columbia 65201

Abstract

The body composition of 56 steers ranging in weight from 183 to 574 kg was estimated from 40K which was measured in a Whole Body Counter. After monitoring in the Counter for 40K, the animals were slaughtered by normal procedures, and analyses of all tissues were made for moisture, ether extract, nitrogen, K, ash and gross energy. Independent variables, live and carcass weight, live and carcass 40K and carcass specific gravity were used to predict the dependent variables, carcass or empty body ether extract, nitrogen, water and gross energy. Significant relationships (P<.01) existed between all independent and dependent variables. The R2 values between 40K and nitrogen, ether extract, water and gross energy were lower than when specific gravity was compared to these dependent variables. However, R2 values obtained when 40K and live weight were used to predict nitrogen, ether extract, water and gross energy of the carcass were .87, .87, .84 and .84, respectively.

The R2 values obtained when 40K and live weight were used to predict fat-free body and fat-free carcass weight were .97 and .96, respectively.

Footnotes

1 Contribution from the Missouri Agricultural Experiment Station. Journal Series No. 7301. Approved by the Director.

2 Department of Food Science and Nutrition.

3 The authors wish to express their gratitude to Dr. David Hutcheson for his assistance with the statistical analysis.

4 Department of Animal Husbandry.






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Copyright © 1976 by the American Society of Animal Science.