Modern protein nutrition is impossible to imagine without the consideration of the role of individual amino acids. Even with an overall positive protein balance, an animal organism can lack protein. This is due to the fact that assimilation of individual amino acids is interconnected, and the lack or excess of one amino acid may result in the lack of the other one.
A part of amino acids are not synthesized in humans and animals. They are named essential amino acids. There are only ten amino acids of this kind. The four of them are critical (limiting) ones – they often restrict the growth and development of animals.
An organism has to receive a sufficient amount of the major limiting acid with feed which makes the use of other amino acids for protein synthesis effective.
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