In general, except lysine and methionine, tryptophan is the most essential amino acid in livestock breeding. For livestock and farmed fish, tryptophan is usually the third or fourth limiting amino acid, and the content of tryptophan in corn, meat meal, and meat and bone meal is very low, but it is relatively high in bean cake. Therefore, in the corn-soybean meal diet, if the lack of soybean meal can cause tryptophan deficiency. An essential amino acid that is important from a nutritional point of view, tryptophan addition is even more important in diets that commonly add methionine and lysine.
Chickens and piglets are susceptible to lack of tryptophan, and tryptophan is commonly used in piglet milk. In addition, 5-hydroxytryptophan, a metabolite of tryptophan, has a stress-resisting effect on animals such as high density and weaning. The addition of tryptophan to low-protein diets is very effective in increasing the weight gain of livestock and poultry and improving feed efficiency. The general addition amount is 0.02% to 0.06%. Tryptophan can be converted to niacin in animals and the conversion efficiency is 50-60:1 in pigs.
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