J. Anim Sci.
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J. Anim Sci. 1978. 46:977-982.
© 1978 American Society of Animal Science
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Breed of Sire and Dam Comparisons for Preweaning Traits under Commercial Beef Cattle Conditions1

F. A. Thrift, S. R. Gallion and C. W. Absher2

University of Kentucky, Lexington 40506

Abstract

Calves were sired by Angus (A), Hereford (H), Charolais (C), Maine-Anjou (M), Simmental (S) and Maine-Anjou x Angus (M x A) bulls and were out of Angus (A), Hereford (H), Angus x Hereford (A x H), Angus x Charolais (A x C) and Angus x Holstein (A x F) cows. Breed of sire was significant for birth weight, weaning weight and weaning condition score; however, breed of dam was significant only for birth weight and weaning weight. For the three traits, the breed of sire by breed of dam interaction was either nonsignificant or the amount of variation accounted for by the interaction was relatively small in relation to the amount of variation accounted for by the main effects of breed of sire and breed of dam. Calves sired by crossbred bulls (M x A) had heavier (P<.01) birth weights but received lower (P<.01) condition scores than calves sired by straightbred bulls (A, H, C, M. S). Weaning weights were similar for calves sired by crossbred and straightbred bulls. Calves from crossbred cows (A x H, A x C, A x F) had heavier (P<.01) birth and weaning weights but received condition scores similar to calves from straight-bred cows (A, H).

Footnotes

1 Published with approval of Director of Kentucky Agricultural Experiment Station as Journal Article 77-5-96.

2 The authors express appreciation to Broadbent Farms, Cadiz, Kentucky, for making the data available for this study.






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