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| Factors | Level (-) | Level (0) | Level (+) |
|---|---|---|---|
| X1: Digestible lysine concentration (g/kg) | 9.2 | 10.65 | 12.1 |
| X2: Energy density (AMEn MJ/kg) | 11.25 | 12.375 | 13.5 |
| X3: Starch: lipid ratios (g/g) | 4.5 | 12.25 | 20.0 |
