Table 4.
Prececal and total tract digestibility, calculated hindgut disappearance (HD) of GE and N, and N retention by growing pigs1
| Dietary Ca, g/kg DM | 5.5 | 8.5 | SEM | P-value | ||||
|---|---|---|---|---|---|---|---|---|
| Exogenous phytase, FTU/kg of diet |
0 | 1,500 | 0 | 1,500 | Ca | Phytase | Ca × phytase | |
| GE | ||||||||
| Prececal digestibility, % | 68.7 | 69.1 | 69.5 | 69.7 | 0.62 | 0.236 | 0.618 | 0.953 |
| Total tract digestibility, % | 84.6 | 84.9 | 85.1 | 85.4 | 0.38 | 0.079 | 0.236 | 0.999 |
| HD, MJ/kg DM | 3.0 | 3.0 | 3.0 | 3.0 | 0.12 | 0.569 | 0.903 | 0.790 |
| N | ||||||||
| Prececal digestibility, % | 76.0 | 75.9 | 75.1 | 76.2 | 0.68 | 0.617 | 0.448 | 0.377 |
| Total tract digestibility, % | 84.4 | 85.8 | 84.6 | 86.2 | 0.98 | 0.602 | 0.019 | 0.807 |
| HD, g/kg DM | 3.1 | 3.5 | 3.3 | 3.6 | 0.40 | 0.427 | 0.105 | 0.614 |
| Intake, g/d | 49.4 | 47.8 | 47.7 | 48.1 | 6.17 | — | — | — |
| In feces, g/d | 7.6 | 6.7 | 7.3 | 6.5 | 0.67 | 0.372 | 0.009 | 0.784 |
| In urine, g/d | 21.2 | 19.9 | 20.7 | 19.5 | 4.89 | 0.907 | 0.743 | 0.653 |
| Retention, g/d | 20.7 | 21.2 | 19.7 | 22.0 | 1.66 | 0.744 | 0.226 | 0.425 |
1Least squares means based on eight observations per diet.