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Effect of Stilbestrol on the Growth Rate of Suckling Lambs¹

South Dakota State College Experiment Station

Abstract

The administration of growth-stimulating hormones and drugs to farm livestock is attracting the attention of many researchworkers. The practice of administering stilbestrol pellets for caponizing cockerels, accelerating fat deposition, and tenderizing the meat of chickens has been accepted by many of the more progressive poultry men. Andrews and Bohren (i947), found with chickens that stilbestrol increased the efficiency of feed energy conversion to edible carcass calories by as much as 75 percent. Dinusson et al. (1949) reported that the simultaneous implantation of four l2 or 24 milligram stilbestrol pellets increased feed consumption, rate of gain, growth rate, and feed efficiency of fattening heifers. More recently, Andrews et al. (1949) reported that the subcutaneous implantation of either 12 milligrams of stilbestrol in pellet form resulted in highly significant increases in the gains of fattening "lambs. The hormone-treated groups required significantly less feed per pound of gain than the

¹ Contribution from the Animal Husbandry Department. Approved for publication by the Director of the Agricultural Experiment Station as contribution No. 23a of Journal Series.

² The authors express their appreciation to Wick and Fry, Inc., for the stilbestrol used in this experiment.