602568 Disclosed herein is a feed composition and methods of affecting the carcass composition of an animal by the administration of Selective Androgen Receptor Modulators (SARM) acylanilide compounds of formula IIIA wherein the variables are defined in the specification. More particularly, the SARMs improve meat production in feedlot animals by increasing the lean mass, reducing the fat mass and/or percent fat mass, improving feed efficiency and modulation of meat quality of an animal wherein said animal is a feedlot animal or a finishing livestock such as beef cattle or swine.
