J. Anim Sci.
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J. Anim Sci. 1988. 66:2508-2516.
© 1988 American Society of Animal Science
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Effect of Preweaning Nutritional Management on Yearling Weight Response in an Open-Herd Selection Program1

J. D. Hough2,3, and L. L. Benyshek4

The University of Georgia, Athens 30602

Abstract

Records on 276 progeny were collected in the final 2 yr (1984 and 1985) of an 8-yr Hereford cattle selection project. Selection was practiced using the top sires from the American Hereford Association's National Cattle Evaluation based on yearling weight expected progeny difference. An unselected control line was maintained to monitor environmental change. One-half of each line was creep-fed during the preweaning period for the last 2 yr to evaluate genotype x environment interactions. Direct response to yearling weight selection averaged 28 ± 8 kg. Correlated response to selection amounted to .057 ± .028 kg/d in preweaning ADG, 14 ± 6 kg in weaning weight, .085 ± .033 kg/d in postweaning ADG, 4.6 ± 1.5 cm in yearling hip height and 11.2 ± 3.0 cm2 in yearling pelvic area. Yearling fat thickness and scrotal circumference were not significantly affected by selection. Significant effects of creep feeding were observed for yearling weight (15 ± 3 kg), preweaning ADG (.067 ± .012 kg/d), weaning weight (13 ± 2 kg), yearling hip height (1.2 ± .5 cm) and yearling fat thickness (.07 ± .03 cm). Postweaning ADG, yearling pelvic area and yearling scrotal circumference were not affected by creep feeding. No significant genetic group x creep feeding effects were found for any of the traits analyzed, indicating calves genetically superior for growth did not gain any additional advantage from creep feeding.

Footnotes

1 This study was partially funded by the Georgia Agric. Exp. Sta. and is State Project S-3-387.

2 The authors express appreciation to Jim Van Meter, herdsman at the Georgia Northwest Branch Station, for his assistance in the conduct of this study.

3 Present address: Dept. of Anim. and Dairy Sci., Auburn Univ., Auburn, AL 36849.

4 Anim. and Dairy Sci. Dept.






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Copyright © 1988 by the American Society of Animal Science.