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U. S. Department of Agriculture, Kansas State University and University of Nebraska
Abstract
Carcasses of 786 steers derived from crosses of Hereford or Angus cows bred to Hereford, Angus, Charolais, Limousin, Simmental, South Devon and Jersey sires were fabricated into closely trimmed, semi-boneless retail cuts to study relationships among independent variables in the U.S.D.A. yield grade equation in breed groups that differ in growth and fattening characteristics.
Simple correlations indicate carcass weight was a good predictor of cutability within a breed group but a poor indicator over all breed groups. Longissimus muscle area had the lowest predictive value of the four variables studied. It may be more useful in populations of similar weight than in those varying widely in weight. Fat thickness at the 12th rib was the most useful predictor of cutability and is about equally useful within or over all breed groups. Percentage of kidney and pelvic fat, though lower in predictive value than 12th rib fat thickness, was useful within or over breed groups. Partial regression coefficients computed within each breed group were relatively similar though there were significant differences in intercept values for the different breed groups. Use of a single prediction equation for all breed groups would rank animals well within a breed group but would on the average underestimate or overestimate animals of a breed group by .1% to over 1% relative to actual cutability.
1 Published as Paper No. 3850, Journal Series, Nebraska Agricultural Experiment Station, Lincoln.
2 Contribution No. 236. Department of Animal Science and Industry, Kansas Agricultural Experiment Station, Manhattan 66506.
3 U. S. Meat Animal Research Center, Agricultural Research Service, Clay Center, Nebraska 68933.
4 Department of Animal Science and Industry, Kansas State University, Manhattan 66506.
5 Department of Animal Science, University of Nebraska, Clay Center 68933.
6 Standardization Branch, Agricultural Marketing Service, U.S.D.A., Washington, D.C. 20250.
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