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Mathematical Models of Postweaning Growth, Feed Intake and Carcass Composition of Beef Cattle. II. Estimation of Chemical and Physical Composition of Gain for Various Biological^1,2,

South Dakota State University, Brookings 57006

Abstract

Data from the literature were utilized to develop prediction equations for physical and chemical composition of live weight of cattle using traits measurable prior to slaughter. Two methods of predicting chemical composition of the dissected cold carcass were developed and compared to the actual chemical composition of six breeds.

From equations developed, estimation of the physical and chemical composition of live weight of steers of several breeds varying in degree of maturity fed on different diets was possible. A computer program is available which predicts the physical composition, chemical composition, and calorific value of live weight gain of steers for different biological types of cattle fed on various diets. Because of limited data, the accuracy of the prediction was evaluated only for the average of Hereford and Angus steers.

¹ Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Pub. No. 1478 of the Journal Series.

² The Authors Acknowledge the Cooperation of Dr. Gerald Smith, USMARC, USDA, Clay Center, NE in Providing Data.

³ Current address: Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Can.