Table 4.

Effects of the diets with different protein sources without and with Bacillus subtilis ATCC 6051a (BS) on performance variables (mean values¹) of broilers.

Items	Protein source	Probiotic inclusion2	Starter (day 0–10)			Grower (day 11–24)			Finisher (day 25–42)			Overall (day 0–42)
			BWG (g)	FI (g)	FCR (g/g)	BWG (g)	FI (g)	FCR (g/g)	BWG (g)	FI (g)	FCR (g/g)	BW (g)	BWG (g)	FI (g)	FCR (g/g)
1	SBM	No	244	298	1.22	769	1,245	1.61	1,705	3,180	1.86	2,766	2,720	4,725	1.73
2	CWP	No	243	299	1.23	761	1,230	1.61	1,677	3,120	1.86	2,728	2,682	4,650	1.73
3	SBM	Yes	245	300	1.22	806	1,265	1.57	1,745	3,210	1.84	2,841	2,795	4,770	1.71
4	CWP	Yes	247	303	1.22	799	1,280	1.60	1,719	3,195	1.85	2,810	2,764	4,780	1.73
SEM			5.27	5.74	0.01	7.16	9.25	0.01	9.94	10.91	0.02	21.78	12.43	11.96	0.01
Main effects3
Protein source (Ps)
SBM			244	299	1.22	788	1,257	1.59	1,725	3,195	1.85	2,803	2,757	4,745	1.72
CWP			245	301	1.23	780	1,255	1.60	1,698	3,155	1.86	2,769	2,723	4,720	1.73
Probiotic inclusion (BS)
No			244	298	1.22	765b	1,235	1.61a	1,691b	3,145	1.86a	2,747b	2,707b	4,690	1.73
Yes			246	301	1.22	802a	1,272	1.58b	1,733a	3,203	1.84b	2,825a	2,780a	4,775	1.72
P-value
Ps effect			0.474	0.317	0.348	0.364	0.843	0.444	0.123	0.554	0.771	0.111	0.207	0.346	0.546
BS effect			0.256	0.098	0.347	0.010	0.203	0.047	0.010	0.175	0.043	0.001	0.001	0.059T	0.353
Ps x BS effect			0.877	0.933	0.758	0.556	0.083T	0.892	0.732	0.326	0.755	0.413	0.853	0.648	0.726

^a,bMeans with different superscripts in a row differ significantly (P < 0.05), T = tendency to be influenced by treatment.

Abbreviations: CWP, cowpea; Ps, protein sources; SBM, soybean meal.

¹Data are means of 6 replicate pens with 20 birds per pen.

²Bacillus subtilis, ATCC 6051a strain: 5.0 × 10¹¹ CFU/g⁻¹ feed.

³Data were analyzed as a 2 × 2 factorial arrangement.