Table 2. Average daily gain (ADG), average daily feed intake (ADFI) and feed efficiency (G/F) of weaned piglets^* fed with antibiotic growth promoters or E. faecalis.

Item	N	P	L	M	H	SEM	P value
							P0	PL	PQ
Phase I (d 1to14)
ADG, g	259 b	282 a	278 a	277 a	290 a	5.03	0.013	0.045	0.444
ADFI, g	411	405	399	406	407	4.73	0.542	0.985	0.493
G/F, g/kg	631 b	695 a	696 a	681 a	712 a	9.88	0.001	0.008	0.188
Phase II (d 15 to 28)
ADG, g	364 d	418 a	379 cd	392 bc	406 ab	5.10	<0.001	0.003	0.261
ADFI, g	695	721	709	719	716	17.21	0.814	0.581	0.565
G/F, g/kg	524 c	579 a	536 bc	546 abc	568 ab	11.44	0.031	0.021	0.748
Overall (d 1 to 28)
ADG, g	312 c	350 a	329 b	335 b	348 a	3.26	<0.001	0.009	0.322
ADFI, g	553	563	555	563	562	8.28	0.829	0.619	0.742
G/F, g/kg	564 c	621 a	593 b	595 b	619 a	6.79	<0.001	<0.001	0.134

*20 pens of piglets (18 piglets per pen) with pen as the experimental unit, and each mean based on 4 replicates.

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).

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