Table 9. Linear and quadratic dose-response of dietary B. licheniformis-fermented products on broilers challenged with C. perfringens.

Item					P value
B. licheniformis-fermented product concentration1	Growth performance			Linear	Quadratic
	Body weight			0.007	0.975
	Average daily gain			0.007	0.988
	Average daily feed intake			0.590	0.145
	Feed conversion ratio			0.130	0.197
	Lesion score
	22 d	Duodenum		0.002	0.783
		Jejunum		0.003	0.326
		Ileum		0.018	0.822
	35 d	Duodenum		0.023	0.258
		Jejunum		0.002	0.029
		Ileum		0.064	0.822
	Intestinal morphology
	22 d	Villus length	Duodenum	<0.001	0.144
			Jejunum	0.039	0.010
			Ileum	0.382	0.009
		Crypt depth	Duodenum	0.127	0.092
			Jejunum	0.180	0.999
			Ileum	0.216	0.618
		Villus length: Crypt depth	Duodenum	0.003	0.047
			Jejunum	0.018	0.353
	Ileum	0.155	0.068
	35 d	Villus length	Duodenum	0.337	0.844
			Jejunum	0.222	0.001
			Ileum	0.174	0.008
		Crypt depth	Duodenum	0.183	0.029
			Jejunum	0.021	0.615
			Ileum	0.033	0.002
		Villus length: Crypt depth	Duodenum	0.224	0.417
			Jejunum	0.007	0.106
			Ileum	< 0.001	0.566

¹Data were analyzed using results of C (basal diet plus C. perfringens challenge), L, (basal diet plus C. perfringens challenge and 1 g/kg B. licheniformis-fermented products), and H (basal diet plus C. perfringens challenge and 2 g/kg B. licheniformis-fermented products) group.