Table 3.

Effects of xylanase (XL) level and its interactions with amino acid (AA) density (10% difference) and additional fat (AF) postpellet in corn-soybean diets with dried distillers grains with solubles for Ross 708 male broilers on BW gain from 1 to 49 d of age.

Item	BW gain, g
	1–17 d	1–35 d	1–42 d	1–49 d
XL, BXU/kg
0	654b	2,632	3,422	4,206a
8,000	659a,b	2,654	3,429	4,198a
16,000	664a	2,650	3,415	4,145b
32,000	662a,b	2,634	3,413	4,175a,b
AA density, %
Low	648b	2,609b	3,382b	4,143b
High	671a	2,677a	3,457a	4,219a
AF, %
0	662a	2,629b	3,402b	4,154b
1.17	657b	2,656a	3,438a	4,208a
Pooled SEM (n = 6)1	5	8	14	16
CV, %	1.72	1.58	1.87	1.65
Effect, P-value2
XL	0.017	0.160	0.798	0.015
AA density	<0.001	<0.001	<0.001	<0.001
AF	0.045	0.003	0.007	<0.001
XL × AA density	0.261	0.171	0.562	0.126
XL × AF	0.238	0.772	0.716	0.338
AA density × AF	0.495	0.681	0.584	0.265
XL × AA density × AF	0.577	0.263	0.218	0.921
Linear regressions for XL
Linear	0.002	0.053	0.922	0.021
Quadratic	0.042	0.035	0.908	0.055
R2	0.70	0.54	0.43	0.48
R2 adjusted	0.67	0.47	0.34	0.39

^a,bMeans within a column, not sharing a common superscript, are significantly different (P < 0.05).

¹Six replicate pens of 22 broilers each per treatment.

²Interactions among treatments on BW gain were not significant for any trait studied (P > 0.05). Therefore, only means for main effects are shown.