INTRODUCTION  The method enables fast quantitative determination in feeds, mixed fodders, and raw materials of the  following amino acids: arginine, lysine, tyrosine, phenylalanine, histidine, leucine and iso-leucine (total),  methionine, valine, proline, alanine, glycine, cysteine, tryptophan, aspartic and glutamic acids. Since during  the sample decomposition asparagine and glutamine are hydrolyzed to aspartic and glutamic acids,  respectively, the content of these two acids represents the total content of both the acids and the amides.