| Code | Definition | Number of Accessions |
| 1 | very low <18,00 (g/100 g dry matter) | 1 |
| 2 | 18,01-21,55 (g/100 g dry matter) | 13 |
| 3 | low 21,56-25,10 (g/100 g dry matter) | 24 |
| 4 | 25,11-28,70 (g/100 g dry matter) | 13 |
| 5 | intermediate 28,71-32,20 (g/100 g dry matter) | 49 |
| 6 | 32,21-35,80 (g/100 g dry matter) | 40 |
| 7 | high 35,81-39,30 (g/100 g dry matter) | 8 |
| 8 | 39,31-42,90 (g/100 g dry matter) | 11 |
| 9 | very high >42,90 (g/100 g dry matter) | 7 |