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Genetic-Environmental Interactions in Identical and Fraternal Twin Beef Cattle. I. Growth from 7 to 24 Months of Age^{1, 2, 3,}

University of Wisconsin, Madison 53706

Abstract

The data were collected on identical and fraternal twin female beef cattle between the ages of 7 months and 24 months. The experimental design included two diets, one high and one low in energy. The high and low energy diets were formulated so that with ad libitum feeding they would provide the animals with two levels of energy. The diets were effective in differentiating the animals for many of the traits studied. There was about 100 kg difference in weight at 24 months of age, but there was little difference in some measures of skeletal size.

Some sets had one member on each diet and other sets had both members on the same diet. This design allowed the estimation of set x diet interactions, which were used to evaluate the importance of genetic-environmental interactions.

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., as a part of Regional Project NC-1, Improvement of Beef Cattle Through Breeding Methods.

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

³ Paper No. 1407 from the Laboratory of Genetics and No. 587 from the Department of Meat and Animal Science.

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