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Carcass Composition and Nitrogen Balances of Swine Fed Thiouracil¹

University of Illinois^,3

Abstract

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

1. Thiouracil fed as 0.15% of the ration causes increased retention of nitrogen in the body during the second and third weeks of feed ng, the period of time that the drug causes the greatest increase in daily gains.
   
2. Neither the physical nor the chemical composition of the carcass is modified significantly when fattening barrows are fed thiouracil during a 4-week period.
   
3. Thiouracil causes partial inhibition of skeletal growth, lowers dressing percentage about 1%, but has no significant effect on thickness of backfat, cutting yields, carcass grade and carcass firmness.
   

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, University of Illinois.

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.