Protein Concentrates as Amino Acid Sources for the Chick: Corn Gluten Meal, Cottonseed Meal and Peanut Meal

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Abstract
Diets containing corn gluten meal, cottonseed meal or peanut meal were fed to young chicks so that all the 20% crude protein of each diet was provided by one of these concentrates. Additions of various amino acids were made, and the effects on growth and efficiency of gain were noted. Corn gluten meal required the addition of arginine, lysine and tryptophane in order to increase the rate of growth from 2% to slightly less than 6% per day. Cystine, glycine, methionine, threonine and valine were already present in adequate amounts. Supplementation of cottonseed meal with both methionine and lysine increased the growth rate from 4% to 7%. The methionine deficiency was found to be less marked than that of lysine, a result which was expected from amino acid analyses. Peanut meal is lacking primarily in methionine, but is also slightly deficient in lysine.

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