Table 1 Data structure, arithmetic means and standard deviation (in brackets)
| Observations (n) | 1,078,966 |
| Herds (n) | 268 |
| Sires (n) | 1,930 |
| Dams (n) | 107,372 |
| Cows (n) | 146,765 |
| SCS (units) | 2.433 (1.149) |
| Milk yield (kg) | 32.82 (7.36) |
| Fat yield (kg) | 1.075 (0.333) |
| Protein yield (kg) | 1.006 (0.239) |
| Days in milk | 151.36 (83.30) |
| CGa | 15,517 |