Table 6.

Immune status and oxidative stress of pigs challenged with E. coli F18⁺ (CH) on d 13 postweaning and fed diets supplemented with multispecies probiotics (PRO).

Item	CH-		CH+		SEM	P-value
	PRO-	PRO+	PRO-	PRO+		CH	PRO	CH × PRO
Spleen weight, g	21.11	26.95	21.18	28.62	3.59	0.813	0.081	0.827
TNFα
Jejunum, pg/mg	0.48	0.40	0.56	0.89	0.23	0.039	0.346	0.126
Ileum, pg/mg	0.86	0.77	1.16	0.71	0.33	0.698	0.401	0.567
Serum1, pg/mL	57.84ab	66.47a	70.01a	44.92b	6.06	0.446	0.187	0.010
Serum2, pg/mL	34.61	35.77	32.50	46.17	6.67	0.516	0.251	0.330
MDA
Jejunum, μmol/mg	0.58	0.65	0.64	0.63	0.12	0.830	0.809	0.717
Ileum, μmol/mg	0.84	0.73	0.89	0.64	0.09	0.854	0.064	0.438
Serum1, μmol/mL	10.19	6.30	14.37	9.88	4.37	0.184	0.153	0.917
Serum2, μmol/mL	11.42	6.21	12.91	10.12	4.92	0.435	0.252	0.725

TNFα = tumor necrosis factor alpha; MDA = malondialdehyde.

^{a, b} Within a row, means without a common superscript letter differ (P < 0.05).

¹Blood samples were collected at d 19.

²Blood samples were collected at d 25.