Abstract
The influence of the supplementation of 0.2 or 0.5% L-Lysine HCl to the chick diet containing 5% fisn meal and 15% soybean oil meal as main protein sources on the growth rate, feed efficiency and protein efficiency ratio of diet was studied, and it was found that they were increased about 10-20% respectively compared with the control diet.
The content of free lysine in the blood was increased in parallel with the supplemented amount and a small increase of free threonine, phenylalanine and valine together with a small decrease of free tryptophan, tyrosine and histidine, glycine and aspartic acid was found. The level of free methionine was very low and there was no effect of the supplement.
There was no increase of free lysine in the liver. However, there were a small increase of tryptophan, arginine and alanine, and a small decrease of threonine, cystine, phenylalanine, tyrosine, leucine+ isoleucine, histidine, aspartic acid and serine. Methionine showed only a very weak reaction.
The sum of all free amino acids except lysine and methionine in the liver was found to decrease by the supplement. And this decrease nearly paralleled with the growth increase.
