J. Anim Sci.
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J. Anim Sci. 1963. 22:699-701.
© 1963 American Society of Animal Science
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Beef Carcass Composition as Influenced by Diethylstilbestrol1

L. L. Wilson, C. A. Dinkel, D. E. Ray and J. A. Minyard2

South Dakota State College, Brookings

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.

Footnotes

1 Department of Animal Science, published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication 596 of the Journal Series. In cooperation with the Agricultural Research Service, U.S.D.A., and Regional Project NC-1, Improvement of Beef Cattle through Breeding Methods.

2 The authors wish to express their appreciation to Robert Schubloom, former Assistant in the Department of Animal Science; to D. K. Hallet, Standardization Branch, Livestock Division, A.M.S., U.S.D.A., Washington 25, D.C.; to the Greenlee Packing Co., Sioux Falls, South Dakota, for assistance in collection of carcass data and to Elizabeth Christianson for assistance in data analysis.






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Copyright © 1963 by the American Society of Animal Science.