J. Anim Sci.
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J. Anim Sci. 1957. 16:961-966.
© 1957 American Society of Animal Science
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The Creatinine Level of Blood Serum as an Indicator of Carcass Composition1

Paul R. Wuthier and P. O. Stratton

Wyoming Agricultural Experiment Station

Abstract

Serum levels of creatinine were found to be significantly related to percentage of lean in the boned 9, 10, and 11th rib cut (r=.55, n=35) and rib-eye area corrected for carcass weight (r=.52, n=27). Although the above correlations were highly significant, the predictions by Serum creatinine were low, r2=.27; and r2=.31. Thus only 27% of the variation of lean of the rib eye as measured by area and 31% of the variation of lean in the boned 9, 10, and 11th rib cut as measured by specific gravity could be accounted for by differences in serum creatinine levels.

The relationships between the estimates of carcass composition were highly significant. The correlation between corrected rib-eye area and percentage of rib-cut lean was .79. The area of external fat and the area of rib-eye measured from colored photographs were used to estimate the proportion of lean. The correlation between this estimate and the proportion of lean in the boned 9, 10, and 11th rib cut determined by specific gravity was .94. The data indicate that this photographic estimate could be used as an accurate estimate of carcass composition.

Footnotes

1 In cooperation with the Animal and Poultry Husbandry Research Branch, A.R.S., U.S.D.A. under Western Regional Project W-1, Beef Cattle Breeding Research. Published with approval of the Director, Wyoming Agricultural Experiment Station as Journal Paper No. 94.






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Copyright © 1957 by the American Society of Animal Science.