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This trial was conducted to investigate the effects of rearing system and stocking density on the grow performance,carcass quality and welfare of broilers.A total of 936 1-day-old male broilers were randomly allocated to four treatments with 6 replicates by a 2 × 2 factorial design,including 2 rearing types(net rearing and floor rearing) and 2 stocking density (low density of 8 birds/m2 and high density of 18 birds/m2).