Table 2.
Variable | Category | % of papers (n) |
---|---|---|
Start of data collection (year) 1 | Before 1995 | 23.5% (16) |
1995 and onwards | 76.5% (52) | |
Start of data collection (year) 2 | Before 2000 | 38.2% (26) |
2000 and onwards | 61.8% (42) | |
Start of data collection (year) 3 | Before 2005 | 58.8% (40) |
2005 and onwards | 41.2% (28) | |
Start of data collection (year) 4 | Before 2008 | 66.2% (45) |
2008 and onwards | 33.8% (23) | |
Start of data collection (year) 5 | Before 2010 | 76.5% (52) |
2010 and onwards | 23.5% (16) | |
Breed | Holstein/Friesian/Holstein-Friesian | 67.6% (46) |
Other 4 | 20.6% (14) | |
Not reported | 11.8% (8) | |
Calving pattern | Year-round | 23.6% (16) |
Other | 27.9% (19) | |
Not reported | 48.5% (33) | |
Grazing regime | Grazing | 35.3% (24) |
Other | 30.9% (21) | |
Not reported | 33.8% (23) | |
Housing system | Cubicle | 48.5% (33) |
Other | 22.1% (15) | |
Not reported | 29.4% (20) | |
Milking system | Conventional | 57.4% (39) |
Other | 2.9% (2) | |
Not reported | 39.7% (27) | |
Study farm(s) belonging to research institute | Yes | 23.5% (16) |
No | 76.5% (52) | |
Study Type | Experimental | 26.5% (18) |
Observational | 73.5% (50) | |
Study design | Cross-sectional | 10.3% (7) |
Longitudinal | 57.4% (39) | |
Negatively controlled RCT | 2.9% (2) | |
Positively controlled RCT | 1.5% (1) | |
Retrospective longitudinal | 27.9% (19) | |
Study unit | Cow | 77.9% (53) |
Culled cow | 5.9% (4) | |
Heifer | 10.3% (7) | |
Lactation | 5.9% (4) | |
Lameness data source | Mobility scoring system | 57.3% (39) |
Records | 41.2% (28) | |
Other | 1.5% (1) | |
Sample size a | Less than 1,230 animals | 52.9% (36) |
1,230 animals or more | 47.1% (32) | |
Sample size b | Less than 5 farms and/or 1,230 animals | 63.2% (43) |
At least 5 farms and 1,230 animals | 36.8% (25) |