The Effect of Progesterone-Estradiol Implants and Stilbestrol Feeding on Feed Lot Performance and Carcass Characteristics of Steers6

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Abstract
The effects of subcutaneous implantation of 1.5 g progesterone - 50 mgestradiol combination pellets were compared with the feeding of 10 mg diethylstilbestrol and no hormone treatment on 800 -lb. steers on a fattening ration. Implanted cattle gained an average of 3.03 lb. per day as compared to 2.64 lb. per day for the stilbestrol fed lot and 2.30 lb. per day for controls. Implantation resulted in less feed than oral stilbestrol treatment, and oral stilbestrol treated cattle required less feed per 100 lb. gain than controls. Neither hormone treatment had any effect on shrink in transit, dressing percentage, visceral weight, or hide weight. There were no significant differences in carcass grade, but implantation resulted in an increase in muscle mass and a reduction in separable carcass fat. Neither moisture content of fat or lean nor ether extract of Longissimus dorsi was affected by treatments. There were no differences in cooking shrink or tenderness of steaks from the treatments. Both hormone treatments resulted in an enlargement of the prostatic portion of the urogenital tract indicating a systemic effect by oral stilbestrol administration. There was no evidence of desquamation or keratinization of epithelium and no evidence of carcinogenesis in any of the tissue examined from the prostatic region.

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