Table 4.
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 daily feed intake from 1 to 49 d of age.
| Item | Feed intake, grams |
|||
|---|---|---|---|---|
| 1–17 d | 1–35 d | 1–42 d | 1–49 d | |
| XL, BXU/kg | ||||
| 0 | 845 | 4,017 | 5,672 | 7,502 |
| 8,000 | 845 | 4,052 | 5,691 | 7,492 |
| 16,000 | 850 | 4,036 | 5,661 | 7,433 |
| 32,000 | 853 | 4,058 | 5,707 | 7,501 |
| AA density, % | ||||
| Low | 844b | 4,022 | 5,658 | 7,453 |
| High | 853a | 4,059 | 5,708 | 7,511 |
| AF, % | ||||
| 0 | 854a | 4,053 | 5,707 | 7,504 |
| 1.17 | 842b | 4,028 | 5,659 | 7,460 |
| Pooled SEM (n = 6)1 | 6 | 18 | 32 | 41 |
| CV, % | 2.34 | 2.38 | 2.34 | 2.27 |
| Effect, P-value2 | ||||
| XL | 0.374 | 0.467 | 0.188 | 0.457 |
| AA density | 0.019 | 0.061 | 0.066 | 0.103 |
| AF | 0.004 | 0.194 | 0.082 | 0.222 |
| XL × AA density | 0.415 | 0.783 | 0.673 | 0.570 |
| XL × AF | 0.287 | 0.592 | 0.566 | 0.263 |
| AA density × AF | 0.150 | 0.230 | 0.654 | 0.604 |
| XL × AA density × AF | 0.469 | 0.336 | 0.676 | 0.757 |
| Linear regressions for XL | ||||
| Linear | 0.598 | 0.506 | 0.757 | 0.195 |
| Quadratic | 0.957 | 0.782 | 0.403 | 0.193 |
a,bMeans within a column, not sharing a common superscript, are significantly different (P < 0.05).
1
Six replicate pens of 22 broilers each per treatment.
2
Interactions among treatments on FI were not significant for any trait studied (P > 0.05). Therefore, only means for main effects are shown.