The United States of America As Represented by the Secretary of

Smithkline Beckman Corporation

Michael T Zavy

Thomas O Lindsey

A method for decreasing the adrenal secretion of glucocorticoids, especially cortisol, in male livestock without substantially suppressing the animal's immune system by oral or other administration of effective doses of melengesterol acetate (MGA) or derivatives thereof. Ideally, the MGA may be used in admixture with the subject animal feed, although it is understood that the compound may be administered separately.

Method to decrease cortisol secretion by feeding melengesterol acetate

Cysteamine is used as an active ingredient in animal feed compositions and in methods for increasing the feed efficiency of immature, monogastric, meat-producing animals. A particularly useful active ingredient of this invention is cysteamine hydrochloride in a quantity selected from the range of 15-1200 ppm.

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El Reno, OK, United States of America

Michael T Zavy