| Feather grade | Maintenance energy correction value | Feather state |
|---|---|---|
| 1 | 0.94 | Feather state of chicken |
| 2 | 1.00 | Feather state of new layer |
| 3 | 1.08 | Head and nect region somewhat depilation |
| 4 | 1.20 | Heavy depilation on head and nect region |
| 5 | 1.40 | Head, neck, and so on, chest region depilation |