SEVERAL workers have recently studied the effect of some of the hormone drugs on the fowl. Mixner, Reineke, and Turner (1944) observed that thiouracil and thiourea resulted in thyroid enlargement. Kempster and Turner (1945) fed thiouracil to ten-week old New Hampshire broilers for a 16-day period and found that rate of growth was not reduced but the dressed carcass grade was improved. Feeding thiouracil for a 36-day period retarded growth and thus reduced efficiency of feed utilization but improved the grade of the dressed birds. Lorenz (1943) found that diethylstilbestrol pellets implanted subcutaneously in the neck of White Leghorn cockerels resulted in more fat in the breast muscle (pectoralis major), leg muscles, tendon, and in depot fat tissue than in the controls. Jaap and Thayer (1944) and Thayer, Jaap, and Penquite (1944) reported that the oral potency of diethylstilbestrol was insufficient for practical use in fattening. These workers reported that .