Table 7.
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 AMEn and apparent digestibility coefficient (ADC) of GE and CP at 42 d of age.
| Item | AMEn (kcal/kg) | ADC, % |
|
|---|---|---|---|
| GE | CP | ||
| XL, BXU/kg | |||
| 0 | 3,233b | 70.77b | 54.26a,b |
| 8,000 | 3,363a | 73.14a | 56.26a,b |
| 16,000 | 3,297a,b | 71.73a,b | 57.47a |
| 32,000 | 3,230b | 70.39b | 53.36b |
| AA density, % | |||
| Low | 3,270 | 71.88 | 55.71 |
| High | 3,291 | 71.14 | 54.96 |
| AF, % | |||
| 0 | 3,215b | 71.05b | 54.35b |
| 1.17 | 3,346a | 71.96a | 56.33a |
| Pooled SEM (n = 6)1 | 19 | 0.42 | 0.77 |
| CV, % | 3.20 | 2.44 | 5.65 |
| Effect, P-value2 | |||
| XL | <0.001 | <0.001 | 0.014 |
| AA density | 0.320 | 0.131 | 0.441 |
| AF | <0.001 | 0.041 | 0.044 |
| XL × AA density | 0.655 | 0.801 | 0.608 |
| XL × AF | 0.003 | 0.005 | 0.273 |
| AA density × AF | 0.573 | 0.529 | 0.271 |
| XL × AA density × AF | 0.609 | 0.775 | 0.105 |
| Linear regressions for XL | |||
| Linear | 0.700 | 0.980 | 0.502 |
| Quadratic | <0.001 | 0.002 | 0.002 |
| R2 | 0.45 | 0.32 | 0.26 |
| R2 adjust | 0.36 | 0.21 | 0.14 |
a,bMeans within a column, not sharing a common superscript, are significantly different (P < 0.05).
1
Six replicates per treatment with 3 broilers sampled from each pen among 22 broilers.
2
XL × AF interaction was significant (P < 0.05) for AMEn and ADC of GE (see Figure 3).