Table 8.

Effects of xylanase (XL) level and its interactions with amino acid (AA) density (10% of difference) and additional fat (AF) postpellet (0 vs. +1.17%) in corn-soybean diets with dried distillers grains with solubles for Ross 708 male broilers on carcass cut-up parts at 49 d of age.

Item	Yield, % of chilled carcass
	Breast	Pectoralis major	Pectoralis minor	Wings	Legs	Breast skin	Rack
XL, BXU/kg
0	35.07	29.18	5.88	9.69	30.31	3.82	20.83
8,000	35.18	29.05	6.11	9.67	29.96	3.61	21.00
16,000	35.33	29.23	6.07	9.70	30.16	3.80	20.39
32,000	35.11	29.15	5.96	9.73	30.17	3.75	20.81
AA density, %
Low	35.19	29.16	5.94	9.75	30.11	3.83a	20.75
High	35.15	29.14	6.07	9.64	30.19	3.66b	20.77
AF, %
0	35.24	29.31	5.99	9.67	30.15	3.78	20.76
1.17	35.15	28.99	6.02	9.72	30.15	3.71	20.75
Pooled SEM (n = 6)1	0.14	0.13	0.05	0.05	0.18	0.05	0.18
CV, %	3.91	3.81	4.80	2.93	2.77	6.10	4.08
Effect, P-value2
XL	0.959	0.953	0.100	0.928	0.503	0.095	0.144
AA density	0.575	0.951	0.089	0.154	0.630	0.009	0.895
AF	0.897	0.202	0.679	0.541	0.987	0.241	0.949
XL × AA density	0.503	0.538	0.241	0.039	0.497	0.564	0.445
XL × AF	0.260	0.097	0.224	0.114	0.169	0.301	0.411
AA density × AF	0.595	0.158	0.857	0.859	0.768	0.306	0.853
XL × AA density × AF	0.478	0.955	0.484	0.076	0.707	0.932	0.897
Multiple linear regressions for XL
Linear	0.640	0.907	0.209	0.662	0.561	0.654	0.315
Quadratic	0.324	0.978	0.028	0.796	0.360	0.366	0.243

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

¹Six replicate pens per treatment with 3 broilers sampled among 22 broilers.

²Only means for significant interactions are showed (P < 0.05). Moreover, XL × AA density interaction was significant (P < 0.05) for wings yield (see Figure 4).