Table 4. Effect of dietary palm kernel meal (PKM) and β-xylanase supplementation on egg quality of laying hens
Item | Egg quality |
Eggshell color1) | Egg yolk color | Haugh unit | Eggshell strength (kg/cm2) | Eggshell thickness (μm) |
Color fan | L* | a* | b* |
Xylanase (%) | PKM (%) |
0 | 0 | 12.7 | 54.4 | 19.8 | 30.4 | 8.4 | 91.4 | 4.4 | 407.0 |
10 | 12.8 | 53.6 | 20.7 | 30.3 | 8.7 | 91.9 | 4.5 | 410.1 |
0.025 | 0 | 12.5 | 54.1 | 19.9 | 30.1 | 8.5 | 91.9 | 4.4 | 411.5 |
10 | 12.5 | 54.1 | 20.3 | 29.7 | 8.7 | 91.7 | 4.5 | 412.0 |
SEM | 0.27 | 0.50 | 0.36 | 0.48 | 0.06 | 0.79 | 0.10 | 3.16 |
Main effect |
Xylanase (%) |
0 | 12.7 | 54.0 | 20.3 | 30.4 | 8.6 | 91.7 | 4.4 | 408.5 |
0.025 | 12.5 | 54.1 | 20.1 | 29.9 | 8.6 | 91.8 | 4.5 | 411.7 |
SEM | 0.19 | 0.35 | 0.26 | 0.34 | 0.04 | 0.56 | 0.07 | 2.24 |
PKM (%) |
0 | 12.6 | 54.2 | 19.8 | 30.2 | 8.4 | 91.6 | 4.4 | 409.2 |
10 | 12.7 | 53.9 | 20.5 | 30.0 | 8.7 | 91.8 | 4.5 | 411.0 |
SEM | 0.19 | 0.35 | 0.26 | 0.34 | 0.04 | 0.56 | 0.07 | 2.24 |
Effect (p-value) |
Xylanase | 0.419 | 0.865 | 0.599 | 0.355 | 0.675 | 0.888 | 0.790 | 0.322 |
PKM | 0.757 | 0.496 | 0.080 | 0.645 | <0.001 | 0.854 | 0.313 | 0.567 |
Xylanase × PKM | 0.938 | 0.407 | 0.467 | 0.784 | 0.410 | 0.640 | 0.901 | 0.682 |
Eggshell color was measured by the color fan scale and CIE [11].