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Effects of Thyroprotein and of Thiouracil Alone and in Sequence in the Ration of Swine¹

New Jersey Agricultural Experiment Station

Abstract

Daily feeding of either 0.075 or 0.15 of a gram of thyroprotein per 100 pounds of liveweight had no influence on gains in body weight or the amount of feed consumed per 100 pounds of gain. Feeding of 0.225 of a gram did not influence gains in weight, but it did increase the amount of feed consumed per 100 pounds of gain. Feeding of higher levels of thyroprotein, 0.5, 1.0 2.0, and 4.0 grams per 100 pounds of liveweight, decreased gains in weight and increased the amount of feed consumed per 100 pounds of gain in weight.

Weanling pigs fed a ration containing 0.1 percent thyroprotein required 87 days to weigh an average of 129 pounds. The controls averaged 125 pounds in 68 days and were more efficient utilizers of feed, consuming 322.1 pounds compared to 449.5 pounds consumed by the experimental group for each 100 pounds of liveweight gained.

¹ Journal Series Paper of the New Jersey Agricultural Experiment Station, Rutgers University, Departments of Animal and Dairy Husbandry, New Brunswick, N. J.