J. Anim Sci.
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J. Anim Sci. 1962. 21:101-107.
© 1962 American Society of Animal Science
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Genetic Analysis of Economic Characteristics of Young Hereford Cattle1

R. L. Blackwell2, J. H. Knox, C. E. Shelby and R. T. Clark

New Mexico Agricultural Experiment Station3, University Park

Abstract

Data from the New Mexico Agricultural Experiment Station on 10 traits of beef cattle (weaning weight and grade, yearling weight, gain, and grade, daily gain in the feed lot, final feed lot weight, slaughter grade, carcass weight, dressing percent and carcass grade) were analyzed to obtain heritability estimates and estimates of the genetic, environmental, and phenotypic correlations among the traits. Separate analyses of weaning and yearling data from steers and heifers under range conditions resulted in similar heritability estimates for most traits as well as comparable correlations among traits. Individual differences in gaining ability of young cattle and other traits which are a function of growth or size were found to be relatively highly heritable when the cattle receive uniform treatment. Genetic correlations were relatively high among traits involving size and growth rate. Grades at different times were moderately to highly heritable and generally highly correlated genetically. Grades and gains or weight at different times tended to exhibit low to negative genetic correlations.

Footnotes

1 Approved by the Director of the New Mexico Agricultural Experiment Station as Paper Number 166 in the Journal Series.

2 The United States Sheep Experiment Station, Dubois, Idaho.

3 Department of Animal Husbandry, Agricultural Experiment Station, New Mexico State University, in cooperation with USDA under Western Regional Project W-1 of beef cattle breeding research.






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Copyright © 1962 by the American Society of Animal Science.