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Mean number of cow years, mean milk production per cow-year and mean % concentrate, silage and pasture in feeding units in the study population and the whole country (tie stalls and free stalls) in 2002 (SD).
| Variable | Herds in study (n = 57) | Herds in Norway (n = 17 476) |
| Cow-years | 28.0 (11.6) | 15.1 (7.3) |
| Milk production/cow-year (kg) | 6359 (788) | 6099 (107) |
| Concentrate (%) | 37.3 (13.2) | 41.4 (18.6) |
| Silage (%) | 40.4 (12.6) | 38.8 (14.3) |
| Pasture (%) | 16.4 (11.7) | 16.6 (10.4) |
