Abstract
Three trials were conducted to determine the effect of diethylstilbestrol (DES) on the blood plasma free amino acid patterns of steers fed finishing diets ad libitum. Results from the trials indicate that when steers were fed diets based upon corn, DES treatment caused a reduction in the concentration of the essential amino acids, except for methionine and histidine which increased. Lysine concentration was especially decreased. Blood plasma concentrations of urea and serine were also depressed due to DES, whereas the concentration of hydroxyproline was markedly increased. When steers were fed a diet based upon wheat in one trial the effect of DES was somewhat different, suggesting that the composition of the diet may have influenced the response.
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