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The Influence of the Oral Administration of Diethylstilbestrol on Certain Carcass Characteristics of Beef Cattle¹

Iowa State College, Ames

Abstract

Four investigations were made on 92 beef cattle in an attempt to determine whether orally administered diethylstilbestrol had any influence on carcass characteristics. The data failed to provide evidence that the feeding of diethylstilbestrol had any consistent influence on carcass characteristics as measured by carcass weight, grade, the fat, lean and bone content of the 9–10–11 rib cut, the area of the cross section of the longissimus dorsin muscle and thickness of fat over the rib-eye muscle. The variations in average daily gains of animals regardless of ration treatment were more consistently associated with differences among a number of carcass characteristics. The correlation coefficients of carcass characteristics within lots with rate of gain were higher than those for carcass characteristics with level of diethylstilbestrol fed. The large differences observed among the various carcass attributes, while probably in part the consequence of nutritional treatments, appear to be related to some degree to inherent biological differences among animals which served as experimental subjects for these studies.

¹ Journal Paper No. J-2802 of the Iowa Agricultural Experiment Station, Ames. Project No. 1239.

² The assistance of William H. Hale and Edmund Cheng who assisted in the collection of the carcass data and the cooperation of Wise Burroughs who directed the nutritional studies of the animals used in the investigations is gratefully acknowledged.