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Individual and Maternal Additive and Heterotic Effects on 205-Day Weight in Beef Cattle¹

South Dakota State University^,4, Brookings 57007

Abstract

Weaning weight records on 47,652 calves in 371 contemporary groups were obtained from the South Dakota Beef Cattle Improvement Association and used to estimate breed individual and maternal additive effects and heterotic effects on 205-d weight. A mixed model was used. Individual additive effects were —22.6 ± 1.3 kg for Red Angus, —19.0 ± 1.1 for Hereford, —12.2 ± .9 for Angus, —11.5 ± 3.1 for Polled Hereford, —10.1 ± 2.2 for Shorthorn, —7.5 ± 4.9 for Tarentaise, 5.3 ± 1.6 for Gelbvieh, 9.5 ± 1.8 for Limousin, 11.4 ± 3.1 for Chianina, 12.4 ± 1.2 for Charolais, 14.6 ± 1.2 for Simmental, and 29.7 ± 3.1 for Maine Anjou. Maternal additive effects were —18.9 ± 2.9 kg for Polled Hereford, —9.2 ± 2.6 for Shorthorn, —6.4 ± 1.0 for Hereford, .3 ± .9 for Angus, 6.3 ± 1.3 for Charolais, 11.0 ± 2.0 for Red Angus, and 16.9 ± 2.0 for Simmental. Pooled estimates of individual and maternal heterosis were 4.4 ± .4 and 6.8 ± .4 kg, respectively.

¹ Published with the approval of the Director of the South Dakota Agr. Exp. Sta. as Pub. No. 1779 of the Journal Series. Cooperative with and a contribution from Regional Project NC-1. Appreciation is expressed to the South Dakota Beef Cattle Improvement Assoc.; to F. W. Crandall, association secretary and Dr. L. M. Anderson, former association secretary for providing the data, and to Peggy Green for secretarial assistance.

² Present address: Roman L. Hruska U. S. Meat Animal Research Center, USDA, SEA-AR, P. O. Box 166, Clay Center, NE 68933.

³ Anim. Sci. Dept., Cornell Univ., Ithaca, NY 14853.

⁴ Dept. of Anim. Sci., P.O. Box 2170.

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