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The Effects of Various Methods of Estrogen Administration on the Growth and Fattening of Wether Lambs¹

Purdue University, Agricultural Experiment Station

Abstract

The subcutaneous implantation of one 12 mg. stilbestrol pellet per lamb, in the neck, scrotum or beneath the eye, was equally effective in significantly improving rate of growth and feed utilization.

The scrotum provides a site of implantation in wether lambs that is effective and this part of the animal is completely discarded at the time of slaughter.

The injection of 12 mg. of dienestrol per lamb in two different injectable bases did not produce a measurable effect over a 70-day experimental period.

The carcass grades of estrogen-treated lambs tended to be inferior to those of the controls.

¹ Contribution from the Department of Animal Husbandry, Journal Paper No. 632, Purdue University Agricultural Experiment Station, Lafayette, Indiana.

² The authors express their appreciation to Wick and Fry, Inc., Cumberland, Indiana, for the stilbestrol and to the Ortho Research Foundation, Raritan, New Jersey, for the dienestrol preparation.