Effect of Antibiotics on the Weight of Chicks and Rats Fed Raw or Heated Soybean Meal

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Abstract
High levels of procain penicillin, chlortetracycline, novobiocin, zinc bacitracin, or streptomycin improved the growth of chicks fed raw soybean meal by an average of 31 to 51%; when heated soybean meal was fed, the antibiotics caused lesser increases, 4 to 14%. Growth on raw soybean meal plus antibiotics was, however, less than that on the heated meal. Antibiotics also stimulated the growth of rats fed raw soybean meal as the only protein source in the diet. The effect was most marked when the level of methionine in the diet was marginal. Novobiocin was considerably less effective in the rat than in the chick.