Phytase was a kind of enzyme for hydrolyzing phytate to release myoinositol and inorganic phosphate, which would promote the utilization of phosphate, reduce the drainage of phosphate in the dejecta and reduce the environmental pollution. The more important thing was to promote the utilization of protein for combined protein, reduce the combination of phytate and microelement and increase the nutrient value of feedstuff. In addition, phytase had great applicable foreground for the addition of phytase to fee...