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Journal of Dairy Science Vol. 53 No. 12 1766-1770
© 1970 by American Dairy Science Association ®
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Influence of Varying Protein and Diethylstilbestrol on Live Performance and Carcass Characteristics of Holstein Steers1

R. H. Kliewer, W. H. Kennick and D. C. Church

Department of Animal Science, Oregon State University, Corvallis 97331

ABSTRACT

Thirty-two Holstein steers were used in a factorial treatment to study the effects of protein levels and diethylstilbestrol implants on daily gain, feed efficiency (feed per kg gain), and carcass characteristics. Four nutritional regimes and two diethylstilbestrol levels were tested. Complete rations were fed individually and contained from 10 to 18% crude protein and constant productive net energy. One-half of the steers each received a total of 54 mg diethylstilbestrol implanted at rates of 12, 18 and 24 mg at live weights of 114, 250 and 365 kg. The other 16 steers were not implanted. Starting and terminal weights averaged approximately 114 and 500 kg.

Daily gain and feed efficiency data indicated that Holstein steers required rations containing more than 11% crude protein with diethylstilbestrol for maximum performance.

There were no main treatment effects among measures of carcass characteristics. However, backfat thickness and marbling scores showed significant ration x implant interactions. These interactions suggested a depression of backfat thickness and marbling scores for implanted compared with nonimplanted steers on rations in excess of 14% crude protein. The reverse was true for steers on rations that contained 14% crude protein or less.

FOOTNOTES

1 Technical paper no. 2571, Oregon Agricultural Experiment Station, Corvallis 97331.






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Copyright © 1970 by the American Dairy Science Association ®.