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Effects of Antibiotics, Amino Acids, Zinc and Enzymes on the Growth Depression in the Turkey Produced by Raw Soybeans^1,2,

Department of Poultry Husbandry, College of Agriculture, and Division of Veterinary Bacteriology, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota

The isonitrogenous-isocaloric inclusion of raw ground soybeans into a corn-soybean meal diet produced a depression in growth in young turkeys which was linearly related to dose when plotted semilogarithmically. The effect of antibiotics in counteracting the growth-retarding effect of raw soybeans was related to the dose of raw soybeans. When the diet contained 68% of ground raw soybeans, the antibiotics (0.1% of procaine penicillin G and 0.1% of streptomycin sulfate) stimulated growth somewhat, but were largely ineffective in reversing the depression. Supplementing diets containing 35% of ground raw soybeans with the antibiotics, methionine, or both, resulted in greater growth responses than for respective controls receiving processed soybean meal and soybean oil, thus indicating activity in helping reverse the raw soybean defect. When the diet contained 20% of ground raw soybeans, the antibiotics essentially reversed the raw soybean growth depression. Zinc supplementation was not beneficial at either the 68% or the 35% level of raw soybean meal; likewise, three dietary enzyme products also proved ineffective at the latter level.

² This study was supported, in part, by grants-in-aid and supplies from Abbott Laboratories, North Chicago, Illinois; Commercial Solvents Corporation, Terre Haute, Indiana; and Merck and Company, Inc., Rahway, N. J. Appreciation is expressed for their interest and assistance.

³ Present address: Walter Reed Army Institute of Research, Veterinary Bacteriology Department WRAMC, Washington 12, D. C.

Manuscript received 17 July 1961.