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Effects of Methyl Thiouracil in the Rations of Lambs and Aged Ewes¹

New Jersey Agricultural Experiment Station

Abstract

Thirteen lambs fed an average of 1.43 grams of methyl thiouracil daily for 41 days showed an average daily gain of 0.24 of a pound and consumed 645 pounds of grain per 100 pounds gain. Thirteen control lambs gained 0.32 of a pound per day and consumed 573 pounds of grain per 100 pounds gain.

The average daily gain of 3 groups of 5 ewes each was: control, 0.41; 0.05 percent thiouracil, 0.59, and 0.10 percent thiouracil, 0.37. The group of ewes receiving 0.05 percent methyl thiouracil required 25 percent less feed per unit of gain than did the control group. There was no advantage in feeding ewes a grain ration containing 0.10 percent methyl thiouracil.

¹ Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers University, the State University or New Jersey; Departments of Animal Husbandry and Dairy Industry.