Sire by Environment Interactions in Beef Cattle Field Data2

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Abstract
The importance of interactions of sire with region, sex, season and herd/region were evaluated in data from two breeds of beef cattle. Birth weight (10,840 records) and 205-day weaning weight (8,780 records) data from the American Simmental Association and 5,169 205-day weaning weight records from the American Maine-Anjou Association were examined. Sire × region interactions were found significant for both traits with genetic correlations of sire breeding values across regions generally ranging from .30 to .80. Sire × sex effects were significant in one of two tests for birth weight and two of three tests for weaning weight with genetic correlations ranging from .56 to .98. Sire × season was tested only for weaning weight in the Maine-Anjou data and was significant with the genetic correlation estimated to be .71. Sire × herd/region was significant for weaning weight but not for birth weight with the genetic correlation estimates at .47 and 1.22, respectively. In general, the magnitude of the sire × location (herds, regions) interaction appeared sufficiently large to cause some biases in sire breeding value estimates based on single herd tests. Copyright © 1979. American Society of Animal Science . Copyright 1979 by American Society of Animal Science.

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