Some Species and Age Differences in Amino Acid Requirements
1950; Elsevier BV; Linguagem: Inglês
10.1016/b978-1-4832-3255-3.50005-x
Autores Tópico(s)Diet and metabolism studies
ResumoThis chapter focuses on some species and age differences in amino acid requirements. From a study of the utilization by the growing rat, the adult rat and adult man of the nitrogen of a series of 6 proteins possessing limiting deficiencies of either lysine or methionine-cystine, it was shown that the biological values were higher for the adult rat than for the growing rat and for adult man when the dietary protein was deficient in lysine, and they were lower when the dietary protein was deficient in methionine-cystine. The proteins of whole egg, prepared in the laboratory, appear to be slightly deficient in lysine for maximum utilization by the growing rat. When the utilization of the nitrogen of the 6 proteins tested in adult nutrition are expressed as the amount of absorbed nitrogen per calorie of basal heat required for nitrogen equilibrium, the values are of the same order of magnitude for the rat and the human, but are definitely larger for the rat in the case of proteins deficient for growth in methionine-cystine, and definitely smaller in the case of proteins deficient for growth in lysine.
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