. 2022 Mar 17;10:54–67. doi: 10.1016/j.aninu.2022.01.009

Table 4.

Effects of subclinical necrotic enteritis challenge, diet type and supplemental enzymes on growth performance of broilers.¹^,²

Challenge	Diet type	Enzyme	Body weight, g		Feed intake, g			Feed conversion ratio, g/g³
Challenge	Diet type	Enzyme	d 9	d 21	d 0 - 9	d 10 - 21	d 0 - 21	d 0 - 9	d 10 - 21	d 0 - 21
Three-way interaction
No	Wheat	Control	265	1,001^bcd	235.9	1,034^ab	1,270^abcd	1.048	1.416^abc	1.327^abc
		XYN10	265	1,025^ab	220.2	1,047^ab	1,268^abcd	0.980	1.381^abcd	1.289^bcd
		XYN11	260	1,028^ab	220.7	1,060^a	1,281^abc	1.007	1.380^abcd	1.296^abcd
		MAN	265	1,043^a	226.4	1,062^a	1,288^a	1.009	1.364^bcd	1.285^bcd
	Maize	Control	257	1,017^abc	222.0	1,061^a	1,283^ab	1.024	1.397^abcd	1.314^abcd
		XYN10	258	1,039^a	233.0	1,032^abc	1,265^abcd	1.067	1.324^cd	1.267^cd
		XYN11	262	1,049^a	229.7	1,027^abc	1,257^abcd	1.045	1.303^d	1.244^abcd
		MAN	259	1,020^ab	221.0	1,048^ab	1,269^abcd	1.008	1.377^abcd	1.294^abcd
Yes	Wheat	Control	267	949^e	235.7	1,005^bcd	1,241^abcde	1.040	1.475^a	1.366^a
		XYN10	263	975^de	231.5	997^cd	1,228^de	1.039	1.402^abcd	1.315^abcd
		XYN11	267	972^de	226.2	1,004^bcd	1,230^de	0.999	1.425^abcd	1.322^abcd
		MAN	260	978^de	227.4	1,010^bcd	1,237^bcde	1.033	1.406^abcd	1.318^abcd
	Maize	Control	253	985^cd	225.2	978^d	1,203^e	1.063	1.333^bcd	1.272^cd
		XYN10	264	977^de	238.6	1,024^abc	1,263^abcd	1.064	1.439^ab	1.349^abc
		XYN11	262	946^e	229.0	977^d	1,206^e	1.048	1.429^abc	1.331^ab
		MAN	260	988^cd	229.2	1,003^bcd	1,232^cde	1.053	1.378^abcd	1.300^abcd
Main effects
Challenge		No	261	1,028	226.1	1,046	1,273	1.023	1.368	1.290
Challenge		Yes	262	971	230.3	1,000	1,230	1.042	1.411	1.321
Diet type		Wheat	264^a	996	228.0	1,027	1,255	1.019^b	1.406	1.315
Diet type		Maize	259^b	1,003	228.5	1,019	1,247	1.046^a	1.372	1.296
Enzyme		Control	260	988	229.7	1,019	1,249	1.043	1.405	1.320
		XYN10	263	1004	230.8	1,025	1,256	1.038	1.386	1.305
		XYN11	263	999	226.4	1,017	1,244	1.025	1.384	1.298
		MAN	261	1,007	226.0	1,030	1,256	1.026	1.381	1.299
SEM⁴			0.8	4.0	1.03	3.5	3.5	0.005	0.006	0.004
P-value
Challenge			0.771	<0.001	0.030	<0.001	<0.001	0.078	<0.001	<0.001
Diet type			0.012	0.195	0.811	0.071	0.116	0.014	0.002	0.013
Enzyme			0.729	0.037	0.214	0.178	0.226	0.523	0.330	0.134
Challenge × diet type			0.991	0.879	0.929	0.953	0.984	0.842	0.888	0.878
Challenge × enzyme			0.605	0.054	0.573	0.175	0.087	0.618	0.014	0.017
Diet type × enzyme			0.151	0.094	<0.001	0.038	0.039	0.177	0.045	0.023
Challenge × diet type × enzyme			0.301	0.025	0.512	0.004	0.019	0.305	<0.001	0.001

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

Means are based on 6 replicates per treatment, and male bird percentage of each replicate was used as a covariate.

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

Feed conversion ratio corrected for mortality.

⁴

SEM = standard error of the mean.