Abstract: One experiment was conducted using a total of 350 one week old Arbor Acre male chicks to investigate the effects of sodium gluconate (NaGlu, 0 and 2%) and phytase (0, 500 and 1000 U/kg) on phosphorus utilization. A 2×3 plus 1 factorial arrangement of treatments was adopted. A positive control diet, adequate in nonphytate P and Ca without NaGlu and phytase, was used. Chickens were randomly assigned by body weight to seven treatments and each dietary treatment was replicated 5 times. The experiment lasted from week 1 to 3 posthatching. The results showed that adding 2% NaGlu improved apparent retention of Ca (P=0.003）and P (P<0.001) and decreased serum alkaline phosphatase activity (P=0.038)of chicks. Supplementation of phytase increased tibia ash weight (P<0.001), apparent retention of Ca(P=0.005）and P (P<0.001). There was a significant interaction between NaGlu and phytase for tibia ash weight (P=0.030) and P apparent retention (P=0.008).

Key words: broiler; phosphorius utilization; sodium gluconate; phytase