J. Anim Sci.
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J. Anim Sci. 1949. 8:501-507.
© 1949 American Society of Animal Science
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Effect of Thiouracil on Rate and Efficiency of Gains of Swine1

S. W. Terrill, J. L. Krider, W. E. Carroll and T. S. Hamilton2

University of Illinois,3

Abstract

Using the paired-feeding, trio-feeding, group-feeding and individual-feeding techniques, 109 fattening swine were fed to determine the practical optimum level of thiouracil to include in the ration and the effect of this level on rate and efficiency of gains.

Within the limits of the conditions covered in the study, the following conclusions appear justified.

  1. Of the levels of thiouracil tested (0.1%, 0.15%, 0.20%, and 0.25%),0.15% represents the most nearly optimum level to add to an adequate ration for fattening barrows weighing 140 to 180 pounds initially. For the remaining purposes of this study, this level of the drug was used.
  2. Under conditions of equalized feed intake, thiouracil increases the rate of gain of pigs significantly and reduces the amount of feed consumed per unit of gain significantly.
  3. When comparable pigs are fed to the limit of appetite either individually or in groups, adding thiouracil to an adequate ration does not increase the rate of gain but it does significantly reduce the amount of feed required per unit of gain as well as the feed consumption.

Footnotes

1 The data contained in this paper are from research by the senior author in partial fulfillment of the requirements for the Degree of Doctor of Philosophy in Animal Science.

2 The authors gratefully acknowledge the donation of the thiouracil by the Lederle Laboratories, Pearl River, New York, through the courtesy of Dr. T. H. Jukes.

3 Department of Animal Science and Division of Animal Nutrition, Urbana, Illinois






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Copyright © 1949 by the American Society of Animal Science.