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Grading and Two- and Three-Breed Rotational Crossing as Systems for Production of Slaughter Steers^{1, 2,}

Georgia Coastal Plain Experiment Station, Tifton 30601⁴

Abstract

THE consistent and cumulative advantage of crossbreeding is making it the accepted method of commercial beef production in the United States. This paper reports results of analyses of postweaning weights and gains and of carcass measurements of steers from an experiment designed to evaluate systems of mating for the production of beef. An earlier report (Chapman, Clyburn and Mc-Cormick, 1970) presented analyses of preweaning data. The experiment using purebred Angus (A), Polled Hereford (PH) and Santa Gertrudis (SG) bulls and grade and crossbred females had the following objectives: (1) to compare grades with crossbreds, (2) to estimate the effects of breeds in grading systems and breed of sire in crossbreeding systems and (3) to compare two-breed and threebreed rotational crossing. The study includes the production of backcross and three breed cross calves (Generation 1), first-rotation two-breed and three-breed cross calves (Generation 2) and contemporary grade calves of each of the breeds of sire mentioned above.

¹ Data were obtained from research conducted in cooperation with the Animal Husbandry Research Division, A.R.S., U.S.D.A., as a part of Regional Project S-10, "Improvement of Beef Cattle in the South."

² University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton, Journal Series Paper No. 848.

³ The authors express their appreciation to E. P. Warren, Computer Center, University of Georgia, Athens, for assistance with data processing.

⁴ Department of Animal Science.