Dietary Supplementation of Astragalus membranaceus Extract Affects Growth Performance, Antioxidant Capacity, Immune Response, and Energy Metabolism of Largemouth Bass (Micropterus salmoides)

Table 4

Hepatic antioxidant abilities of M. salmoides fed diets supplemented with different levels of AME.

	Con	AME0.1	AME0.2	AME0.3	AME0.4	AME0.5	AME0.6	Regression
								Linear	Quadratic
MDA^a (nmol mgprot^−1)	0.53 ± 0.02^a	0.48 ± 0.07^ab	0.34 ± 0.05^ab	0.28 ± 0.06^b	0.29 ± 0.02^b	0.42 ± 0.02^ab	0.53 ± 0.06^a	0.510	0.001
SOD^b (U mgprot^−1)	456.16 ± 29.90	453.36 ± 19.20	432.50 ± 31.41	424.93 ± 27.50	474.95 ± 51.63	448.85 ± 20.65	499.84 ± 38.73	0.331	0.297
CAT^c (U mgprot^−1)	8.00 ± 0.60^b	12.06 ± 1.10^a	12.12 ± 0.98^a	11.10 ± 0.49^ab	10.79 ± 0.52^ab	11.28 ± 0.55^ab	11.07 ± 0.56^ab	0.260	0.056
GSH-Px^d (U mgprot^−1)	22.99 ± 0.26	20.64 ± 2.13	18.87 ± 1.69	18.71 ± 2.05	19.05 ± 2.10	18.78 ± 1.03	19.24 ± 1.15	0.113	0.093

Values are means ± SEM of three replications. Means in the same row with different superscripts are significantly different (). ^aMDA, malondialdehyde; ^bSOD, superoxide dismutase; ^cCAT, catalase; ^dGSH-Px, glutathione peroxidase.