The main objective of this study was to determine the non-phytate phosphorus (NPP) requirementfor broiler chicks from22to42days of age by investigating the effect of dietary NPP levels onperformance, carcass traits, meat quality, bone mineral content (BMC), bone mineral density (BMD),body bone mineral content, body bone mineral density and tissue gene expression of NaPi-Ⅱa mRNA,NaPi-Ⅱb mRNA and AKP mRNA of broilers. A total of500commercial1-d-old Arbor Acres malebroilers were housed in electrically heated, ...