Estimates of Phenotypic and Genetic Parameters in Ten Years of Miles City R.O.P. Steer Data

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Abstract
The phenotypic and genetic relationships existing between and within various traits thought to be of economic importance in beef cattle were investigated in a 10-year block (1947–1956) of data collected at the U. S. Range Livestock Experiment Station at Miles City, Montana, in Record of Performance tests. Records of 616 steers from grade cows mated to 87 bulls representing 11 lines of breeding were used. Genetic, phenotypic and environmental correlations and heritabilities were estimated for 18 traits. Mass selection for A.D.G. or final weight would be moderately effective. Sib or progeny test were indicated for most carcass traits. Little correlated response in desired carcass traits would result from selection for preslaughter traits except for length of body and leg. Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science