The significant advances made in our knowledge of amino acid nutrition of animals are undoubtedly due to the supply of amino acids at affordable prices. In the case of feed-grade lysine and methionine the economics are largely in favour of their routine use in animal feeds. Kusomoto (2001) provides an outline of the processes used in the industrial manufacture of amino acids. Four methods are used:
Fermentation technology is now so advanced that many amino acids destined for commercial feed applications are currently being produced by this method (Table 26.9).
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