Table 2.

Growth performance 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
BW, kg
Initial	6.99	6.97	6.98	7.03	0.19	0.517	0.735	0.453
d 9	7.35	7.92	7.57	7.70	0.52	0.992	0.337	0.543
d 13	7.83	8.91	7.98	8.65	0.79	0.915	0.099	0.691
d 19	9.45	11.43	9.32	10.96	1.42	0.708	0.032	0.831
d 25	11.79	15.19	11.82	14.20	2.19	0.708	0.031	0.689
ADG, g/d
Pre-challenge	65	149	77	124	65	0.864	0.099	0.633
Post-challenge	330	523	320	462	118	0.604	0.019	0.708
P1 (d 0 to 9)	40	106	66	74	63	0.937	0.342	0.463
P2 (d 9 to 25)	278	454	266	406	106	0.617	0.013	0.764
Overall	192	329	194	287	89	0.688	0.031	0.666
ADFI, g/d
Pre-challenge	180	273	234	249	60	0.707	0.203	0.361
Post-challenge	512	756	514	722	159	0.860	0.018	0.839
P1 (d 0 to 9)	145	207	185	190	51	0.716	0.320	0.400
P2 (d 9 to 25)	448	672	472	637	139	0.942	0.023	0.718
Overall	339	505	369	476	105	0.992	0.038	0.646
G:F ratio
Pre-challenge	0.36	0.54	0.32	0.49	0.14	0.585	0.044	0.967
Post–challenge	0.65	0.70	0.62	0.64	0.05	0.207	0.347	0.655
P1 (d 0 to 9)	0.29	0.52	0.35	0.38	0.18	0.808	0.362	0.468
P2 (d 9 to 25)	0.63	0.68	0.56	0.64	0.05	0.161	0.066	0.683
Overall	0.57	0.65	0.53	0.60	0.07	0.211	0.069	0.922

G:F ratio = gain-to-feed ratio.