Influence of Year and Season of Birth, Sex, Sire, and Age of Dam on Weights of Beef Calves at 60, 120, 180 and 240 Days of Age

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Abstract
Weight records of 893 calves were used in analyses to determine least squares estimates of effects, the significance of differences and percentage of variance associated with year and season of birth, sex, sire and age of dam at 60, 120, 180, and 240 days of age in 2 herds of Aberdeen Angus and one herd of Hereford cattle. One of the Aberdeen Angus herds was maintained under a more intensive system of management at a different location. These data indicated the need for consideration of age of calf, and system of management in the standardization of calf weight records for sex, season of birth and age of dam. The development of correction factors for use under systems of management and environmental conditions similar to those under which they are to be applied is indicated.