| Code | Definition | Number of Accessions |
| 1 | very low <15,60 (g/100 g dry matter) | 1 |
| 2 | 15,61-16,80 (g/100 g dry matter) | 4 |
| 3 | low 16,81-18,00 (g/100 g dry matter) | 13 |
| 4 | 18,01-19,20 (g/100 g dry matter) | 24 |
| 5 | intermediate 19,21-20,40 (g/100 g dry matter) | 43 |
| 6 | 20,41-21,60 (g/100 g dry matter) | 21 |
| 7 | high 21,61-22,80 (g/100 g dry matter) | 42 |
| 8 | 22,81-24,00 (g/100 g dry matter) | 17 |
| 9 | very high >24,00 (g/100 g dry matter) | 2 |