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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^{1, 2,}

Arkansas Agricultural Experiment Station, Fayetteville

Abstract

Least squares estimates of the effects of year and season of birth, sex, sire, and age of dam on the weight of beef calves at 60, 120, 180 and 240 days of age were computed. Weight records of 893 calves were analyzed and studied separately for three herds. The size and statistical significance of differences and the percentage of variance associated with the five factors studied appear large enough to justify correction of weight records at these ages in the evaluation of breeding animals. These data indicate 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.

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

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