| Code | Definition | Number of Accessions |
| 1 | very low < 9,75 (g/100 g dry matter) | 5 |
| 2 | 9,76-10,50 (g/100 g dry matter) | 3 |
| 3 | low 10,51-11,25 (g/100 g dry matter) | 15 |
| 4 | 11,26-12,00 (g/100 g dry matter) | 17 |
| 5 | intermediate 12,01-12,75 (g/100 g dry matter) | 22 |
| 6 | 12,76-13,50 (g/100 g dry matter) | 10 |
| 7 | high 13,51-14,25 (g/100 g dry matter) | 17 |
| 8 | 14,26-15,00 (g/100 g dry matter) | 13 |
| 9 | very high >15,00 (g/100 g dry matter) | 5 |