| This Experiment was conducted to investigate the most optimum selenium source and suitable addition level for broiler by feeding experiment, slaughter experiment and metabolize experiment, serum physiological and biological indices analysis experiment. A 2 X 2 factorial arrangement of treatments in a completely random design was conducted at two phases: prophase and anaphase (3-31days, 32-56days) using a total of 340 1day-old Liang Fenghua boilers. Two sources of (Sodium selenite and Selenomethionine) were add at 0mg·kg-1, 0.15 mg·kg-1, 0.3 mg·kg-1 to corn-soybean meal diets to study effect of different Se source and concentration on the production performance. At day 31 and day 56, six broilers in each repli(?)tion were slaughtered to determine carcass trait and meat quality. At the same time, various tissues and blood samples were collected. The basal diet of prophase and anaphase were containing 0.13 mg·kg-1 Se. At day 31, the apparent retention of selenium rate of different Se sources and different Se levels was studied based on the metabolism experiment. The results showed that:1. Se source had no any effect (P>0.05) on growth rate, feed conversion efficiency, meat production (Carcass rate, Half eviscerating rate, Total eviscerating rate, Breast muscle rate, Leg muscle rate).2. Se levels had no any effect (P>0.05) on growth rate, feed conversion efficiency, meat production (Carcass rate, Half eviscerating rate, Total eviscerating rate, Breast muscle rate, Leg muscle rate).3. According to the result of the drip loss measured trial and the whole serum antioxidation indexes measured trial, Se-Met can improved meat quality, the level of 0.28 mg·kg-1 has the good perfo rmance.
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