Table 3. Diarrhea incidence^* of weaned piglets fed with neomycin or E. faecalis.

Item	N	P	L	M	H	SEM	P value
							P0	PL	PQ
Phase I (d 1to14),%	4.2	2.9	3.8	3.3	2.3	0.45	0.075	0.010	0.860
Phase II (d 15 to 28),%	9.0a	4.2b	5.1b	4.0b	3.8b	0.41	<0.001	<0.001	<0.001
Overall (d 1 to 28),%	6.6a	3.6bc	4.4b	3.7bc	3.0c	0.35	<0.001	<0.001	0.001

N (negative control, basal diet); P (positive control, diet supplemented with neomycin); L, M, H (diets supplemented with probiotics 0.5×10⁹, 1.0×10⁹ and 2.5×10⁹ CFU/kg feed, respectively); SEM (standard error of the mean); P₀ (Statistical differences); P_L, P_Q (linear, and quadratic effect of 4 different doses of probiotics, respectively).

* Diarrhea incidence (%) = the total number of diarrheal piglets over the period divided by the number of piglets and days in the period multiplied by 100.

^{a, b, c} Mean values in the same row with different superscripts differ significantly (P₀ < 0.05).