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Effect of Feeding Thiouracil to Swine on the Rate of Gain and Weight of the Thyroid Gland¹

Agricultural and Mechanical College of Texas

Abstract

The addition of 0.25 percent thiouracil to the ration of growing Hampshire and Duroc Jersey swine was found to depress the growth rate. The weight gains of animals were so reduced that the control animals nearly doubled the gains made by the group fed thiouracil. The controls made a total gain per pig of 74 pounds as compared to 38 pounds by the animals fed thiouracil in a 51 day period. Thiouracil did not appear to reduce the rate of gain during the first 9 to 18 days of the feeding trial, but a progressive reduction in the rate of gain was observed thereafter. The feed intake and feed efficiency was also lower for those animals fed thiouracil.

A difference in response to treatment was observed between the two breeds used in this work. The Duroc Jersey hogs consumed a larger amount of feed than the Hampshires and attained higher gains as well as a higher efficiency of feed utilization.

¹ Some of the data were taken from a thesis submitted by RamonAcevedo in partial fulfillment of the requirements for a Master of Science degree. The assistance of Prof. C. B. Godbey with the statistical analyses is greatly appreciated.