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