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The Effect of Terramycin on the Growth of Pigs Fed Different Levels of Protein¹

Michigan Agricultural Experiment Station

Abstract

Eighty 25 pound pigs were used to study the effect of terramycin on the growth of pigs fed different levels of protein.

Terramycin at 5 mg. per pound of total ration had a highly significant effect on rate of gain and also improved efficiency of gain. It did not seem to affect the requirement of the pigs for protein.

The pigs receiving the 15 percent protein ration (reduced to 12 percent at 100 pounds) did just as well as the pigs receiving the 18 percent protein ration (reduced to 15 percent at 100 pounds).

It is suggested that our present standards for protein for pigs may be higher than they need to be, and that the high level of B vitamins used in this study may be related to an increased efficiency of protein utilization.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1327.

² Departments of Animal Husbandry, Agricultural Chemistry and Animal Pathology, Michigan State College, East Lansing, Michigan. This work was supported in part by a grant from Central Soya Co., Inc., Fort Wayne, Indiana. The authors are also indebted to Charles Pfizer Co., Inc., Brooklyn, N. Y. for the terramycin, and to Merck & Co., Inc., Rahway, N. J. for the B vitamins used in this study.