[Constant level of intestinal amino acids as a function of the composition of same]

The present study was conducted with pigs. It was designed to investigate whether extreme amino acid proportions in the ration would influence the excretion of endogenic amino acids in the faeces. Addition of DL-methionine or L-Lysine produced slight changes in the composition of endogenic intestiornal protein, a fact that was practically of little or no importance for the method of faecal analysis used in determining the true digestibility of amino acids (classical technique).