Table 5.

Effects of curcumin on antioxidative capability of laying hens.

Item	Control	100 mg/kg	150 mg/kg	200 mg/kg
SOD (U/ml)	13.40 ± 1.08	13.68 ± 0.54	13.94 ± 0.70	13.28 ± 0.84
GSH-Px (U)	4.81 ± 1.40a	6.38 ± 1.70a,b	5.39 ± 1.28a,b	7.17 ± 1.45b
CAT (U/ml)	6.47 ± 0.49a	6.23 ± 0.97a	8.45 ± 1.67b	7.05 ± 1.55a,b
MDA (nmol/ml)	7.84 ± 1.42	6.92 ± 1.60	6.04 ± 1.79	7.26 ± 1.24

Abbreviations: CAT, catalase; GSH-Px, glutathione peroxidase; MDA, malondialdehyde; SOD, superoxide dismutase.

^a,bMeans within a row with different superscripts differ significantly (P < 0.05).

^A,BDifferent capital superscripts within a row indicate a highly significant difference (P < 0.01).

Values are mean ± SE of 8 hens.