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Phosphorus is one of the essential macroelements for livestock and poultry. It is a component of animal bones and plays
significant roles in energy metabolism, protein synthesis and reproduction 1-4. Lack of phosphorus will cause slow growth,
productivity decline and decrease in feed utilization efficiency. It also causes osteomalacia or rickets if in acute deficiency 5. Cornsoy
based diets are rich in phytic acid, which is largely not available to poultry and other non-ruminant animals 6-9. Lack of
phytase in gastric tract of monogastric animals results in low efficiency of phosphorus utilization 10. Therefore, usually large
quantity of inorganic phosphorus is supplemented to meet the nutrition demand for phosphorus. However, feed cost is usually
increased with the price flow up of inorganic phosphorus. Meanwhile, the accompanying phosphorus excretions also cause
severe pollution to the environment.
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