J. Anim Sci.
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J. Anim Sci. 1985. 60:1396-1402.
© 1985 American Society of Animal Science
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Sire x Environment Interactions in Beef Cattle Weaning Weight Field Data1

J. K. Bertrand2, P. J. Berger3 and R. L. Willham3

Iowa State University, Ames 50011

Abstract

Weaning weight field records, supplied by the American Polled Hereford Association, were used to examine sire x environment interactions. Sire x herd/region and sire x contemporary group/herd interactions were evaluated from a data set containing 19,503 records. Sire x region interaction was evaluated from a data set containing 8,659 records. The genetic correlations of sire progeny performance across contemporary groups/herd were .59 and .37 across herds and contemporary groups/region. The average genetic correlation of sire progeny performance across regions was .64. Heritability of weaning weight was .11 across regions, .17 within region and .28 within herd. Mixed-model sire analyses of Polled Hereford weaning weight field records should include sire x herd/region and sire x contemporary group/herd random effects to reduce the sire x environment effects particular to any herd or contemporary group, and to account for the distribution of sire progeny across herds and contemporary groups in the estimation of prediction error variance. It may be necessary to perform separate sire analyses for some regions to evaluate the breeding values of sires in regions where rank changes are likely to occur.

Footnotes

1 Journal Paper No. J-11634 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 2000.

2 Dept. Anim. and Dairy Sci., Univ. of Georgia, Athens 30602.

3 Dept. of Anim. Sci., Iowa State Univ., Ames 50011.






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Copyright © 1985 by the American Society of Animal Science.