Table 8
Digestibility coefficients of amino acids for duck (3 weeks old white Pekin ducks)
| Amino acid | Apparent ileal digestibility (%) |
|---|
| [23] | [47] | [74] |
|---|
| Alanine | 66.0 | 79.2 | 79.3 |
| Arginine | 71.0 | 87.1 | 87.1 |
| Aspartate + asparagine | 60.0 | 74.6 | 74.6 |
| Cystine | 67.0 | 70.9 | 70.9 |
| Glutamate + glutamine | 81.0 | 85.9 | 85.9 |
| Glycine | 59.0 | 74.5 | 74.5 |
| Histidine | – | 82.7 | 82.7 |
| Isoleucine | 65.0 | 77.7 | 77.7 |
| Leucine | 73.0 | 79.4 | 79.4 |
| Lysine | 66.0 | 79.0 | 79.0 |
| Methionine | 80.0 | 84.8 | 84.7 |
| Phenylalanine | 73.0 | 81.5 | 81.5 |
| Proline | – | 75.7 | 75.7 |
| Serine | 70.0 | 71.4 | 71.4 |
| Threonine | 64.0 | 69.6 | 69.6 |
| Tryptophan | – | 84.9 | 84.9 |
| Tyrosine | – | 76.4 | 76.4 |
| Valine | 62.0 | 74.1 | 74.1 |