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Effect of Inbreeding and Selection on Performance Characteristics of Beef Cattle¹

Oregon Agricultural Experiment Station, Corvallis

Abstract

The combined effects of selection and inbreeding of calf and of dam were studied using 280 calves from four inbred lines of Hereford and Angus cattle. No evidence of an effect of inbreeding of the calf on birth weight, post weaning rate of gains or feed economy during performance test was found. The failure of inbreeding to depress feed-test criteria was considered to be due to the compensation of selection for the expected inbreeding depression. Significant effects due to inbreeding were found for suckling gains, age at 500 lb. body weight and age at 800 lb. body weight. There was a significant positive association between inbreeding of dam and rate of gain of her calf indicating the effectiveness of selection for rate of gain.

¹ This study was conducted in co-operation with the Agricultural Research Service, U.S. Department of Agriculture, and State Experiment Stations under Western Regional Research Project W-1 on Beef Cattle Breeding Research. Technical Paper No. 1377, Oregon Agricultural Experiment Station, Corvallis, Oregon.