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Effects of Stilbestrol and Testosterone Pellets Implanted into Growing-Fattening Pigs^{1, 2,}

University of Wisconsin

Abstract

The effects of implanting pellets of stilbestrol and testosterone subcutaneously were studied with 42 growing-fattening pigs. Two lots of seven pigs each were assigned to each experimental group—control, testosterone implanted, and stilbestrol implanted. The implantations were made at the beginning of the experiment and 12 weeks later. The pigs averaged 43 pounds at the start of the experiment and were slaughtered as they reached 210 pounds. The following characteristics were studied: average daily gain, feed per 100 pounds gain, daily feed consumption, dressing percentage, length of carcass, weight of regular ham, percent of external fat in the regular ham, eye muscle measurement, fat back thickness, length of femur, specific gravity of the femur, weight of leaf fat, and seediness of the fresh belly. Of these characteristics, seediness of the belly in the stilbestrol group is the only one that showed a significant deviation from the control.

The reproductive organs of the treated pigs showed definite evidence of hormonal stimulation.

¹ Paper from the Department of Animal Husbandry and the Department of Genetics No. 469. Published with the approval of the Director of the Agricultural Experiment Station.

² Supported in part by the Research Committee of the Graduate School from funds supplied by the Wisconsin Alumni Research Foundation.

³ The authors wish to acknowledge the assistance of B. P. Haasl and L. P. Brunker.