Beef Carcass Composition as Influenced by Diethylstilbestrol

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Abstract
One hundred fifty-two steer calves from 27 sires and 11 ranches were randomly allotted into two groups on the basis of sire and weight. One group received diethylstilbestrol as an implant and the other served as a control group. All animals were fed a fattening ration in one lot for 237 days. The treated animals averaged significantly higher for daily gain, final conformation, market grade, estimated percent carcass lean, rib-eye area, fat thickness and specific gravity of the 9-10-11 rib section. Although the treated group averaged lower for carcass grade and ether extract of the longissimus dorsi muscle, no significant differences existed for these traits. There were essentially no group differences in carcass conformation, color of lean or yield grade. Treated steers had significantly lower marbling scores. There were no significant sire-treatment interactions except for ether extract of the longissimus dorsi muscle. Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science

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