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Implanted and Oral Stilbestrol for Fattening Steers^1,2,3,4,

University of Georgia, Athens

Abstract

Three experiments were conducted to determine the effects of oral and low level implants of stilbestrol in steers fed high levels of blackstrap molasses. In each of the three experiments the feeding of 10 mg. of stilbestrol per head daily failed to produce significant increases in gains of treated steers over the control steers. Carcass grades and dressing percentages were not significantly affected by treatments.

The implantation of as little as 24 mg. of stilbestrol per steer produced a significant increase in the average daily gains of treated steers over control steers in experiment III but not in experiment II, although the trend was in the same direction. The evidence indicates that for feeding periods of 120 to 150 days duration, 24 mg. of implanted stilbestrol will be more effective in increasing weight gains on rations involving high levels of molasses than either 12 mg. implanted or 10 mg. fed.

In experiment II estrogenic activity of livers from steers which received the hormone either orally or implanted was not significantly different from the controls based on uterine weight response of intact 21-day-old mice.

In experiment III steers which were implanted with stilbestrol while on pasture did not do as well when placed in drylot as steers that had not been previously implanted. A second implant as the steers were placed in drylot resulted in some stimulation of daily gains. However, those steers which were implanted for the first time as they were placed in drylot responded most favorably to treatment. There was no apparent advantage from the feeding of stilbestrol in conjunction with its use as implants in this study.

¹ The stilbestrol pellets (Capette) were furnished by Wick and Fry, Inc. through the courtesy of W. S. Davidson.

² The stilbestrol (Stilbosol) fed was contributed by Eli Lilly Co. through the courtesy of R. M. Keck.

³ The authors wish to express appreciation to J. W. Lassiter, R. F. Sewell, and E. P. Warren of the Animal Husbandry staff for their helpful suggestions in the preparation of this manuscript.

⁴ Contribution from the Department of Animal Husbandry. Journal Paper No.32 of the College Experiment Station.

⁵ Presently a member of the Animal Husbandry staff, Washington State College.