Table 4.

Effect of graded levels of XOS (mg/kg feed) on serum antioxidant indices of weaned piglets

Item	CON	XOS100	XOS500	XOS1000	SEM	P-value	Linear	Quadratic
Day 14
T-AOC, U/mL	4.5	4.7	5.1	4.8	0.08	0.174	0.136	0.199
T-SOD, U/mL	136.4b	137.8b	143.3a	139.9ab	0.76	0.018	0.025	0.125
GSH-Px, U/mL	701.8	721.7	735.4	711.7	5.21	0.211	0.398	0.065
MDA, nmol/mL	4.6a	4.5ab	4.1b	4.5ab	0.08	0.138	0.354	0.092
CAT, U/mL	3.3b	3.9ab	4.2a	3.5b	0.10	0.024	0.338	0.005
Day 28
T-AOC, U/mL	4.3b	5.2ab	5.6a	5.0ab	0.14	0.031	0.065	0.017
T-SOD, U/mL	137.1b	142.3ab	144.9a	139.6ab	0.94	0.038	0.229	0.010
GSH-Px, U/mL	732.2	759.4	750.6	736.4	8.27	0.735	0.964	0.295
MDA, nmol/mL	4.5a	4.0ab	3.6b	4.2a	0.08	0.007	0.116	0.003
CAT, U/mL	3.3b	4.2a	4.5a	4.3a	0.11	<0.001	<0.001	0.002

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