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[Research and development of enzymes used in feed].

Enzymes can degrade the anti-nutrient factors in feedstuff, increase nutrient digestibility, and reduce pollution to environment, and have been widely supplemented in animal feedstuff. However, the use of enzymes is limited because of their undesirable properties, such as thermoliability and susceptibility against protease digestions. And its commercialization is also limited by low production efficiency and high cost. Therefore, the focuses for future enzyme development will be: (1) to obtain novel enzymes with better properties by high-throughput screening of enzyme encoding genes, especially those from extreme and special environments; (2) to improve enzyme properties using directed mutagenesis and protein engineering methods; (3) to achieve high-level fermentation of enzymes by heterogonous expression and optimization of codons, vectors and fermentation conditions; (4) to determine the effect of enzymes to animals and utilize enzymes efficiently.