Table 4.

Antioxidant-related genes expression in skeletal muscle of Xiangcun black finishing pigs fed the diets with various levels of mulberry powder.

Item	Mulberry inclusion level, %					SEM	P-value
	0	3	6	9	12		ANOVA	Linear	Quadratic
Longissimus dorsi muscle
SOD1	1.07ab	1.12a	0.78b	0.95ab	0.82ab	0.10	0.09	0.05	0.13
GPX1	1.07	1.29	1.08	1.21	1.48	0.15	0.33	0.13	0.25
NFE2L2	1.03	0.77	0.89	0.98	0.74	0.10	0.21	0.27	0.54
GCLC	1.03	0.93	0.83	0.96	0.81	0.09	0.34	0.13	0.29
Biceps femoris muscle
SOD1	1.05	0.92	1.12	0.81	1.00	0.11	0.32	0.56	0.81
GPX1	1.02b	1.14ab	1.53a	1.22ab	1.32ab	0.10	0.09	0.12	0.11
NFE2L2	1.03	0.79	1.15	0.96	1.03	0.12	0.37	0.71	0.92
GCLC	1.04	0.88	0.92	0.79	0.96	0.12	0.67	0.50	0.45

SOD1 = superoxide dismutase 1; GPX1 = glutathione peroxidase 1; NFE2L2 = nuclear factor erythroid 2-like 2; GCLC = glutamate cysteine ligase catalytic subunit.

^{a, b} Within a row, values with different superscript letters differ (P < 0.05). n = 6.