J. Anim Sci.
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J. Anim Sci. 1965. 24:502-506.
© 1965 American Society of Animal Science
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Heritabilities, Phenotypic Correlations, and Genetic Correlations Involving Preweaning Gain and Weaning Grade of Beef Calves1

T. J. Marlowe2 and D. W. Vogt3

Virginia Agricultural Experiment Station, Blacksburg

Abstract

The purpose of this study was to obtain estimates of heritability which would be applicable to a broad segment of the beef cattle industry. Data included performance records collected over an 8-year period from 1955 through 1962 on 12,145 offspring of 580 Angus and 8,279 offspring of 409 Hereford sires. Traits studied were average daily gain from birth to weaning and weaning grade.

Heritability estimates were obtained for each of the two breeds through paternal half-sib analyses of variance for each sex separately and for all sexes combined. For Angus calves combined estimates were 0.38±.03 and 0.36±.04 for ADG and grade, respectively. Corresponding values for Hereford calves were 0.31±.04 and 0.33±.04.

Paternal half-sib analyses of variance and covariance were also used in estimating the components required to compute phenotypic and genetic correlations between preweaning ADG and weaning grade. These estimates, using data pooled over sexes, were 0.23±.01 and 0.23±.06 for Angus and 0.28±.01 and 0.21±.08 for Hereford calves.

Footnotes

1 Published with the approval of the Director, Virginia Agricultural Experiment Station.

2 Professor, Department of Animal Science, Virginia Polytechnic Institute, Blacksburg.

3 Present address: Antigenic Laboratory, Department of Animal Science, Iowa State University, Ames, Iowa.






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