Tryptophan is an important essential amino acids and animal limiting amino acids, including L-tryptophan digestibility of up to 100%. After the metabolism of tryptophan can produce many biologically active substances (eg, nicotinic acid and 5 - HT, etc.). 

 Nutritional effects of L-tryptophan: tryptophan added exogenous tryptophan can improve the content of the diet to improve the dietary amino acid composition and proportion of dietary protein increase the value and efficiency. Be satisfied in the lysine and methionine, the limiting amino acid tryptophan as an important dietary supplement of exogenous tryptophan quality protein diet can reduce the amount of feed cost savings, reduce the amount of dietary protein feed, saving formula space. 

 L-tryptophan in the non-nutritional role: added exogenous tryptophan, can play the appropriate role of biologically active substances. Animal feed can promote not only weaken the stress response and improve the animals sleep, but also can increase the fetus and pups of the antibodies, increased milk Lactating animals