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Supplementation of a Corn-Meat and Bone Scrap Ration for Weanling Pigs¹

Michigan Agricultural Experiment Station^,4

Abstract

A corn-meat and bone scrap ration supplemented with minerals and vitamins was found to be inadequate for the growth of pigs fed in drylot. The addition of 0.06 percent of DL-tryptophan to this ration allowed growth to proceed at the same rate as that observed on a corn-soybean oil meal diet. When half of the meat and bone scrap protein was replaced with soybean oil meal protein growth equaled that obtained in the corn-soybean oil meal lot. Aureomycin was not effective in counteracting the tryptophan deficiency of the basal ration.

¹ Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 1409.

² The data contained in this paper are a portion of the research and thesis to be presented by the senior author in partial fulfillment of the requirements for the Degree of Doctor of Philosophy, School of Graduate Studies, Michigan State College, East Lansing. Present address Larro Research Farm, Detroit, Michigan.

³ Present address A. E. Staley Mfg. Co., Decatur, Illinois.

⁴ Departments of Animal Husbandry, Agricultural Chemistry and Animal Pathology, Michigan State College, East Lansing. The authors are indebted to Lederle Laboratories Division, American Cylanamid Co., Pearl River, New York for the aureomycin and B vitamins, and to the Dow Chemical Company, Midland, Michigan for the DL tryptophan. This work was supported in part by a grant from Central Soya Company, Inc., Fort Wayne, Indiana.