This experiment was conducted to evaluate the effects of different levels of turmeric rhizome powder (TRP) on production performance, egg quality and some serum metabolites of older laying hens. A total of 240 hens (Hy-Line W-36) in their second laying cycle were randomly assigned to 5 dietary treatments (basal diet supplemented with 0.0, 0.5, 1, 1.5, and 2 g kg-1 TRP) with 12 replicates and 4 birds each. Results showed that 2 g kg-1 of TRP decreased (P