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Genotype-Environment Interactions in Postweaning Rate of Gain of Beef Cattle^1,2,

University of Arkansas, Fayetteville

Abstract

Post-weaning gains of 42 groups of progeny that included 408 performance-tested bull calves and 402 limited fed heifer calves on pasture were studied by least squares procedures. Management and sex were completely confounded thus providing an environment in which the remainder of the genotype was expressed. In six separate herd-season analyses, differences in environment were highly significant, sire differences were not significant and the sire-environment interaction was not significant. These analyses indicated that sires were ranked similarly on the basis of their sons gain on performance test and their daughters gain under limited feeding on pasture.

¹ Published with the approval of the Director of the Arkansas Agricultural Experiment Station.

² A publication of Southern Regional Beef Cattle Breeding Project, S-10.