Table 2.

Effect of B. subtilis–fermented products on the growth performance of broilers.

Item	C1	CL2	LL3	HL4	SEM	P value	P value5
							Linear	Quadratic
Body weight (g/bird)
1 d	45.4	45.4	45.4	45.4	0.02	0.883	0.114	0.874
14 d	374.9	385.8	381.3	406.3	6.46	0.620	0.189	0.469
21 d	638.5	611.6	619.5	660.4	8.31	0.224	0.012	0.609
Average daily gain (g/d/bird)
1–14 d	23.5	24.3	24.0	25.8	0.46	0.622	0.192	0.469
15–21 d	37.7a	32.3b	34.0a,b	36.3a,b	0.68	0.042	0.008	0.730
1–21 d	28.2	27.0	27.3	29.3	0.40	0.225	0.012	0.609
Average daily feed intake (g/d/bird)
1–14 d	26.0	26.5	27.4	27.5	0.42	0.402	0.443	0.627
15–21 d	65.8	63.6	67.7	66.7	1.96	0.485	0.700	0.613
1–21 d	39.3	38.9	41.6	40.6	1.03	0.392	0.714	0.487
Feed conversion ratio
1–14 d	1.1	1.1	1.2	1.1	0.02	0.694	0.599	0.259
15–21 d	1.8	2.0	2.0	1.8	0.06	0.469	0.446	0.685
1–21 d	1.4	1.4	1.5	1.4	0.03	0.241	0.501	0.315

^{a, b}Means within a row lacking a common superscript differ (P < 0.05).

¹C, control broilers without lipopolysaccharide challenge.

²CL, lipopolysaccharide-challenged broilers.

³LL, 1 g/kg of B. subtilis–fermented product–treated and lipopolysaccharide-challenged broilers.

⁴HL, 3 g/kg of B. subtilis–fermented product–treated and lipopolysaccharide-challenged broilers.

⁵Data were analyzed using the results of the CL, LL, and HL group.