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Sire by Environment Interactions in Beef Cattle Field Data^{1 ,2,}

University of Nebraska³, Lincoln 68583

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 x region interactions were found significant for both traits with genetic correlations of sire breeding values across regions generally ranging from .30 to .80. Sire x 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 x season was tested only for weaning weight in the Maine-Anjou data and was significant with the genetic correlation estimated to be .71. Sire x 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 x location (herds, regions) interaction appeared sufficiently large to cause some biases in sire breeding value estimates based on single herd tests.

¹ Published as Paper No. 5497, Journal Series, Nebraska Agricultural Experiment Station, Lincoln, NE 68583.

² The authors acknowledge the cooperation and assistance of Don Vaniman, American Simmental Assoc., and Annette Bennett, American Maine-Anjou Assoc.

³ Animal Science Department.