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objective of this study was to investigate the effects of phytase supplementation on grow- th performance, slaughter performance, growth of internal organs and small intestine, and se-rum biochemical indices of broilers. A total of 360 1-day-old Ross 308 broilers were randomly divided into 4 groups with 3 replicates and 30 broilers per replicate (15 male, 15 female). The treatments were fed with basal diet supple-mented with 0%, 0.01%, 0.02% and 0.03% phy-tase. The results showed that: 1) Phytase sup-plementation increased the body weight gain and the body weight of Ross 308 broilers (P < 0.05); 2) Compared with the control group, the feed containing 0.02% phytase increased the eviscerated carcass ration (P < 0.05); 3) The feed supplemented phytase could improve the weight of liver (P < 0.05); 4) The phytase supplementa- tion was good for the weight and the length of small intestine; 5) The phytase supplementation which improved the serum phosphorus (P) con- sistency and lowered serum calcium (Ca) con- sistency was 0.02%. According to the above analysis, the feasible supplementation of phy-tase (enzyme activity for 5000 u/g) in broiler dietary was 0.02%.
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