Abstract
Chlortetracycline, stilbestrol and graded levels of animal fat were fed to fattening steers in a factorial experimental design. The addition of stilbestrol increased the rate of gain and reduced the amount of feed required per unit of gain. Five percent animal fat in the ration had a similar effect. Ten percent animal fat had no significant effect upon the rate of gain but reduced the amount of feed required per unit of gain in comparison to rations without added fat. Stilbestrol reduced the amount of feed required per unit of gain in rations without animal fat; when fat was added, stilbestrol had no effect. Chlortetracycline significantly increased the rate of gain in one period out of three. It also decreased the incidence of liver abscesses.
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