The determined curcumin content of the sample used in our study was relatively low, averaging 1.16±0.03% by weight. Experimental treatments had no significant effect on daily feed intake and body weight gain of chicenks at different periods (Table 2). Although final body weight of chicenks fed diet supplemented with turmeric powder was numerically higher than in control group, but the differences observed did not reach statistical significance. Supplementation of 3.3, 6.6 and 10 g/kg turmeric powder improved feed efficiency over the 21-42 d and 1-42 d periods compared with control group (P0.05) differences due to treatment effects were observed on mortality.