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Genetic-Environmental Interactions in Identical and Fraternal Twin Beef Cattle. II. Feed Efficiency, Reproductive Performance, Conformation Score and Fat Thickness^{1, 2, 3,}

University of Wisconsin, Madison 53706

Abstract

The extent and kind of genetic-environmental interaction in laboratory and farm mammals has been summarized by Chapman (1968). The results of an experiment on genetic-environmental interaction in growth from 7 to 24 months of age in beef cattle has been reported by Kress, Hauser and Chapman (1971).

The purpose of the present study was to evaluate the magnitude and direction of genetic-environmental interactions for feed consumption, feed efficiency, reproductive performance, score and fat thickness of beef cattle. An effort was made to determine whether there were any significant interactions due to changes in rank of the genotypes among environments. Pairs (sets) of identical and fraternal twin cattle and two diets provided the framework for estimating set x diet interactions for each measured trait.

The data were collected over a period of 5 years, from 1964 to 1969, from 15 sets of identical and 14 sets of fraternal twin female beef cattle.

¹ Published with the approval of the Director of the Agricultural Experiment Station. The data were obtained from research conducted in cooperation with the Animal Science Research Division, A.R.S., U.S.D.A., s a part of Regional Project NC-1, Improvement of Beef Cattle Through Breeding Methods.

² Support from Tri-State Breeders Cooperative, Westby, Wisconsin is gratefully acknowledged.

³ Paper No. 1408 from the Laboratory of Genetics and No. 588 from the Department of Meat and Animal Science.

⁴ Present address: Animal and Range Sciences Department, Montana State University, Bozeman.