Table 8.
Effects of phytase on Cu, Fe, Mn and Zn balance in growing pigs (Exp. 2)
| Item | Positive control | Phytase level (FTU/kg) | SEM | p-value | |||||
|---|---|---|---|---|---|---|---|---|---|
|
|
|
||||||||
| 0 | 500 | 1,000 | 20,000 | Treat | Linear | Quadratic | |||
| Copper, Cu | |||||||||
| Intake (mg/d) | 16.1 | 17.0 | 19.7 | 19.7 | 19.7 | ||||
| Digestibility (%) | 17.8b | 18.5b | 27.3a | 29.3a | 29.5a | 2.08 | <0.01 | 0.06 | <0.01 |
| Retention (mg/d) | 2.26b | 2.54b | 4.45a | 4.94a | 4.99a | 0.44 | <0.01 | 0.05 | <0.01 |
| Utilization (%) | 13.8b | 14.7b | 22.8a | 24.9a | 25.1a | 2.31 | <0.01 | 0.09 | <0.01 |
| Iron, Fe | |||||||||
| Intake (mg/d) | 119.3 | 111.4 | 126.7 | 124.8 | 120.4 | ||||
| Digestibility (%) | 34.0 | 33.3 | 36.5 | 37.6 | 37.3 | 3.12 | 0.81 | 0.68 | 0.37 |
| Retention (mg/d) | 39.6 | 36.2 | 45.0 | 45.9 | 43.9 | 3.84 | 0.36 | 0.70 | 0.11 |
| Utilization (%) | 32.8 | 32.2 | 35.5 | 36.6 | 36.3 | 3.18 | 0.80 | 0.66 | 0.38 |
| Manganese, Mn | |||||||||
| Intake (mg/d) | 31.3 | 31.9 | 34.2 | 34.2 | 33.3 | ||||
| Digestibility (%) | 30.6 | 29.7 | 35.0 | 34.5 | 35.4 | 3.34 | 0.64 | 0.45 | 0.26 |
| Retention (mg/d) | 9.5 | 9.2 | 11.9 | 11.6 | 11.6 | 1.06 | 0.24 | 0.49 | 0.09 |
| Utilization (%) | 30.0 | 29.1 | 34.5 | 33.8 | 34.8 | 3.33 | 0.63 | 0.46 | 0.26 |
| Zinc, Zn | |||||||||
| Intake (mg/d) | 95.5 | 77.4 | 77.4 | 89.5 | 83.5 | ||||
| Digestibility (%) | 22.7b | 24.6b | 23.6b | 23.8b | 26.9ab | 1.25 | 0.20 | 0.05 | 0.58 |
| Retention (mg/d) | 19.8 | 17.2 | 16.5 | 19.5 | 20.6 | 1.09 | 0.05 | 0.02 | 0.17 |
| Utilization (%) | 20.8 | 22.2 | 21.2 | 21.7 | 24.5 | 1.26 | 0.27 | 0.07 | 0.69 |
a–b
Means in the same row with different superscripts differ (p<0.05).