| High-protein | Low-protein | SEM | P-value | ||||
---|---|---|---|---|---|---|---|---|
Item | - | + | - | + | P1 | B2 | P × B3 | |
Crude protein | 76.4 | 75.4 | 80.0 | 76.6 | 2.09 | 0.273 | 0.310 | 0.573 |
Indispensable amino acids | ||||||||
 Arginine | 85.4 | 84.8 | 87.1 | 84.7 | 1.35 | 0.563 | 0.286 | 0.534 |
 Histidine | 80.4 | 79.2 | 82.9 | 79.7 | 1.70 | 0.398 | 0.211 | 0.551 |
 Isoleucine | 79.3 | 78.6 | 82.5 | 79.1 | 1.96 | 0.356 | 0.313 | 0.513 |
 Leucine | 81.1 | 80.3 | 83.8 | 80.6 | 1.73 | 0.389 | 0.269 | 0.501 |
 Lysine | 84.8 | 84.3 | 87.5 | 84.2 | 1.38 | 0.351 | 0.194 | 0.327 |
 Methionine | 89.7 | 89.3 | 91.4 | 89.0 | 1.03 | 0.492 | 0.200 | 0.349 |
 Phenylalanine | 78.6 | 78.1 | 82.0 | 79.0 | 1.99 | 0.295 | 0.386 | 0.522 |
 Threonine | 76.6 | 75.7 | 79.5 | 75.3 | 2.09 | 0.546 | 0.235 | 0.446 |
 Tryptophan | 75.1 | 73.2 | 78.1 | 73.8 | 2.47 | 0.470 | 0.226 | 0.628 |
 Valine | 78.8 | 78.9 | 81.9 | 78.1 | 1.93 | 0.403 | 0.232 | 0.471 |
Dispensable amino acids | ||||||||
 Alanine | 70.6 | 68.9 | 75.5 | 71.0 | 2.66 | 0.197 | 0.257 | 0.605 |
 Aspartic acid | 74.6 | 73.4 | 78.6 | 74.7 | 2.32 | 0.263 | 0.284 | 0.566 |
 Cystine | 74.3 | 72.6 | 78.9 | 74.5 | 2.33 | 0.176 | 0.200 | 0.568 |
 Glutamic acid | 86.4 | 85.7 | 88.9 | 86.9 | 1.22 | 0.148 | 0.267 | 0.601 |
 Glycine | 65.5 | 63.4 | 70.1 | 64.3 | 2.91 | 0.352 | 0.188 | 0.521 |
 Proline | 82.7 | 81.4 | 85.3 | 82.2 | 1.64 | 0.312 | 0.197 | 0.611 |
 Serine | 76.7 | 75.2 | 79.7 | 76.3 | 2.10 | 0.341 | 0.244 | 0.665 |