Table 5.

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

Item	CON	XOS100	XOS500	XOS1000	SEM	P-value	Linear	Quadratic
Day 14
IgA, mg/mL	1.03	1.10	1.19	1.14	0.02	0.149	0.058	0.241
IgG, mg/mL	7.40	7.87	8.23	7.95	0.10	0.068	0.043	0.088
IgM, mg/mL	0.91	0.91	0.99	0.99	0.02	0.300	0.085	0.962
Day 28
IgA, mg/mL	1.02	1.06	1.03	1.05	0.01	0.833	0.732	0.799
IgG, mg/mL	7.19c	7.97ab	8.20a	7.58bc	0.10	0.002	0.072	<0.001
IgM, mg/mL	0.98	0.91	0.96	0.98	0.02	0.587	0.756	0.281

^a–cMeans in a row with different superscripts differ significantly (P < 0.05).