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Effects of Stilbestrol and a Combination of Progesterone and Estradiol on Growing-Finishing Swine^{1, 2,}

Missouri Agricultural Experiment Station, Columbia

Abstract

Forty-eight Poland China barrows were used in an experiment designed to study the influence of subcutaneous stilbestrol and progesterone-estradiol (high and low level) implants on average daily gain and carcass composition.

The hormone implants had no significant effect on gain; although stilbestrol and the high level progesterone-estradiol combination (500 mg.–10 mg.) tended to reduce growth rate.

The progesterone-estradiol implants decreased average backfat probe significantly.

Carcasses of the control and treated barrows were similar; however, those from barrows implanted with the high level of progesterone and estradiol showed a trend toward increased leanness.

¹ Contribution from the Missouri Agricultural Experiment Station Journal Series No. 2125. Approved by Director.

² This research was in cooperation with the Regional Swine Breeding Laboratory, A.H.R.D., A.R.S., U. S. Department of Agriculture.