Table 6. Nutrient digestibility of Korean native ducks fed diets with two levels of crude protein and apparent metabolic energy during 22 to 56 days
| DM (%) | Crude protein (%) | Ether extract (%) | Energy (%) |
| Items |
| AMEn (kcal/kg) | Protein level (%) | |
| 3,100 | 17 | 75.61 | 69.53 | 82.35 | 69.70 |
| 3,100 | 16 | 76.17 | 70.50 | 83.84 | 68.54 |
| 3,000 | 17 | 74.90 | 68.45 | 81.26 | 68.42 |
| 3,000 | 16 | 75.64 | 70.08 | 81.12 | 67.68 |
| SEM | 1.155 | 1.271 | 1.300 | 1.238 |
| AMEn (kcal/kg) |
| 3,100 | | 75.89 | 70.01 | 83.10 | 69.12 |
| 3,000 | | 75.27 | 69.26 | 81.19 | 68.05 |
| SEM | | 0.816 | 0.899 | 0.919 | 0.875 |
| Protein level (%) |
| 17 | | 75.26 | 68.99 | 82.45 | 69.06 |
| 16 | | 75.91 | 70.29 | 82.48 | 68.11 |
| SEM1 | | 0.816 | 0.899 | 0.919 | 0.875 |
| Probability |
| AMEn | | 0.60 | 0.56 | 0.49 | 0.40 |
| Protein | | 0.58 | 0.32 | 0.81 | 0.45 |
| AMEn×Protein | | 0.94 | 0.80 | 0.89 | 0.87 |
Pooled standard error of the means.