The Effect of Various Levels of Orally Administered Methyl Testosterone on Growth and Carcass Composition of Swine

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Abstract
Growing and fattening hogs were fed an average of from 0 to 62 mg. of methyl testosterone per animal daily in a free-choice protein supplement in drylot from a starting weight of 51 lb. to a final weight of from 210 to 220 lb. A daily intake of 27 mg. or more of methyl testosterone resulted in highly significant growth depression. However, it was in this range that decreased fat deposition was apparent as indicated by significantly less back fat thickness. Even though free-choice consumption of protein supplement containing the graded levels of methyl testosterone was fairly constant, consumption of corn decreased as the level of methyl testosterone increased. The slower-gaining pigs consuming the higher levels of the hormone required less corn per unit of gain, but were less efficient in conversion of protein supplement, than pigs fed no hormone or than pigs fed either 9 or 17 mg. per day. Copyright © . .

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