| Denmark | Finland | Norway | Sweden | ||||
---|---|---|---|---|---|---|---|---|
 | Study herdsa | All dairy herdsa | Study herds | Target population | Study herds | Target population | Study herds | Target population |
 | Mean | Mean | Median (p25; p75)b | Median (p25; p75)b | Median (p25; p75)b | Median (p25; p75)b | Median (p25; p75)b | Median (p25; p75)b |
Average herd size (cow-years) | 109 | 126 | 26.4 (20.8; 37.8) | 25.4 (19.7; 35.5) | 21.4 (18.1; 27.9) | 21.2 (17.6; 27.6) | 49.2 (33.9; 74.5) | 45.4 (30.8; 69.2) |
Age at first calving (months) | – | – | 25 (25; 27) | 25 (25; 26) | 25.8 (24.7; 27.3) | 25.6 (24.5; 27.1) | 27.6 (26.4; 29.3) | 27.8 (26.3; 30.0) |
Calving to first insemination (days) | – | – | 92 (83; 104) | 93 (83; 106) | 76 (69; 84) | 78 (70; 86) | 89 (80; 99) | 91 (81; 105) |
Average yearly milk yield per cow (kg) | 8,914 | 8,922 | 9,122 (8,372; 9,796) | 8,738 (7,991; 9,443) | 7,233 (6,434; 7,805) | 7,008 (6,366; 7,622) | 9,446 (8,671; 10,047) | 9,313 (8,516; 9,999) |
SCC status geometric meand (1,000 cells) | 241 | 245 | 154 (108; 202) | 156 (114; 209) | 127 (101; 155) | 130 (104; 159) | 218 (184; 281) | 226 (177; 284) |
Fat percentage (%) | 4.41 | 4.26 | 4.16 (3.94; 4.38) | 4.22 (4.00; 4.43) | 4.15 (3.96; 4.39) | 4.41 (3.92; 4.43) | 4.19 (4.04; 4.34) | 4.18 (4.04; 4.33) |
Protein percentage (%) | 3.47 | 3.41 | 3.44 (3.38; 3.51) | 3.45 (3.38; 3.51) | 3.39 (3.34; 3.46) | 3.39 (3.32; 3.46) | 3.41 (3.34; 3.50) | 3.14 (3.33; 3.49) |