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Diethylstilbestrol, Oxytetracycline, Linseed Oil Meal, Soybean Oil Meal and Levels of Corn Silage in Cattle Fattening Rations^{1, 2, 3,}

University of Minnesota, St. Paul

Abstract

Results of four trials are reported in which diethylstilbestrol and oxytetracycline (alone or in combination), linseed oil meal, soybean oil meal and various levels of corn silage were fed to fattening cattle.

Average daily gains were increased significantly and less feed per unit gain was required when diethylstilbestrol and a combination of diethylstilbestrol and oxytetracycline were fed in two trials. Oxytetracycline increased daily weight gains significantly in one trial and slightly in three other trials. It improved efficiency of feed use. Cattle fed linseed oil meal gained 5% more rapidly than cattle fed soybean oil meal. Cattle "full-fed" silage during the high-forage phase of feeding had significantly lower carcass grades than cattle fed lesser amounts of silage.

¹ Paper No. 4345, Scientific Journal Series of the Minnesota Agricultural Experiment Station.

² Acknowledgement is due Charles Pfizer & Co., Inc. for partial financial support and supplies of oxytetracycline, and Eli Lilly and Co. for diethylstilbestrol.

³ The authors are indebted to Dr. C. E. Gates, Univ. of Minn., for statistical advice.