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Effect of Arginine on Weight Gain of Chicks Consuming Diets First-limiting in Lysine or Tryptophan¹

Department of Nutrition, Ontario Agricultural College, University of Guelph, Guelph, Ontario, Canada

The effect of excess dietary arginine on the weight gain of chicks fed diets first-limiting in lysine or tryptophan was studied. The same basic diet, with amino acids supplied by soybean protein, zein, methionine and glycine was used in all experiments. The gain of chicks fed the basic diet was limited by the lysine content of the diet, and when the diet was supplemented with lysine, by its tryptophan content. When lysine was first-limiting the addition of 0.8% or 1.3% of L-arginine·HCl reduced weight gains somewhat, but the effect was not consistent for all experiments. When tryptophan was first-limiting a marked reduction in weight gain was observed in all trials when arginine was added. This effect was not found when supplemental tryptophan was included with the arginine.

Manuscript received 16 November 1967.