The outlook for amino acids as supplements is arguably better now than at any time in the past. In poultry nutrition, for example, supplements of limiting essential amino acids are utilized more efficiently for growth than equivalent quantities supplied as intact proteins. This feature may be more universally applicable to other species. The ban on mammalian proteins in animal feed further reinforces the favourable prospects for amino acids, including not only lysine and methionine but threonine and tryptophan as well. However, the question of supplementation of ruminant diets with the amino acids that limit microbial growth and ruminal fermentation remains to be resolved. The safety of amino acids as feed supplements has been accepted for at least three decades. Amino acids may also serve in the amelioration of N pollution from animal wastes. All of these aspects will sustain interest in amino acids as nutrients and supplements for many years to come.

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