| Trait | N | Mean | σ |
---|---|---|---|---|
 | Milk Yield (kg) | 914 | 158.3 | 231.2 |
 | Fat Yield (kg) | 914 | 6.1 | 7.6 |
Sires | Protein Yield (kg) | 914 | 5.8 | 6.6 |
 | Fat Percentage (kg) (× 1000) | 914 | 4.9 | 142.3 |
 | Protein Percentage (kg) (× 1000) | 914 | -0.96 | 82.7 |
 | Somatic Cell Score (loge SCC) (× 1000) | 773 | 34.2 | 104.9 |