Table 13.

Effects of subclinical necrotic enteritis challenge, diet type and supplemental enzymes on abundance of caecal bacteria group at 16 d of age (log₁₀ genome DNA copies/g wet digesta).^1,2

Main effects		Bacillus	Bacteroides	Bifidobacterium	Lactobacillus	Enterobacteriaceae	C. perfringens	Ruminococcus
Challenge	No	7.80	5.87	9.93a	11.03b	8.18b	1.83b	9.51
	Yes	7.81	5.87	9.75b	11.23a	8.44a	9.32a	9.51
Diet type	Wheat	7.76	5.91	10.04a	11.34a	8.42a	5.80	9.47
	Maize	7.85	5.83	9.63b	10.92b	8.20b	5.35	9.55
Enzyme	Control	7.82	5.90	9.79	11.11	8.35	5.67	9.52
	XYN10	7.82	5.96	9.70	11.24	8.24	4.89	9.53
	XYN11	7.88	5.85	9.99	11.07	8.38	5.90	9.49
	MAN	7.70	5.77	9.86	11.09	8.26	5.83	9.49
SEM3		0.048	0.030	0.048	0.056	0.052	0.453	0.018
P-value
Challenge		0.915	0.937	0.039	0.047	0.011	<0.001	0.847
Diet type		0.333	0.229	<0.001	<0.001	0.027	0.358	0.055
Enzyme		0.613	0.181	0.109	0.617	0.727	0.443	0.845
Challenge × diet type		0.856	0.662	0.683	0.074	0.422	0.987	0.426
Challenge × enzyme		0.098	0.942	0.605	0.165	0.381	0.524	0.421
Diet type × enzyme		0.742	0.462	0.510	0.608	0.067	0.439	0.934
Challenge × diet type × enzyme		0.660	0.332	0.290	0.560	0.782	0.540	0.998

^a,b Within a column, means with no common superscripts differ significantly (P < 0.05).

¹Means are based on 6 replicates per treatment with 4 birds per replicate.

²Control = no enzyme; XYN10 = xylanase from family 10; XYN11 = xylanase from family 11; MAN = β-mannanase.

³SEM = standard error of the mean.