L-Tryptophan is a necessary amino acid for the growth of young animals and it is the main amino acids used in feed after lysine, methionine and threonine. Adding tryptophan can improve the utilization efficiency of amino acids, increase feed intake, promote growth and enhance immunity. Stress reaction of piglets after weaning can be relieved and breeding efficiency can be improved with tryptophan, which has been widely used in feeds.
