Table 1 Characteristics of the farms included in the study
Farm | Year of inclusion | Number of sows | Farrowing schedule (weeks) | Age at weaning | Biosecurity level before inclusion | Mass vaccination of fattening units | Number of vaccinated batches of piglets |
|---|---|---|---|---|---|---|---|
1 | 2012 | 320 | 3 | 28 | High | Yes | 9 |
2 | 2007 | 290 | 3 | 28 | Medium | Yes | 7 |
3 | 2010 | 320 | 5 | 21 | Low | Yes | 6 |
4 | 2007 | 200 | 3 | 28 | Medium | No | 5 |
5 | 2013 | 240 | 3 | 28 | Low | Yes | 9 |
6 | 2013 | 160 | 3 | 28 | Low | Yes | 8 |
7 | 2014 | 300 | 2 | 21 | High | Yes | 11 |
8 | 2014 | 120 | 3 | 28 | High | No | 8 |
9 | 2005 | 110 | 3 | 28 | High | No | 6 |
10 | 2013 | 500 | 2 | 21 | High | Yes | 6 |
11 | 2013 | 120 | 3 | 28 | Low | Yes | 9 |
12 | 2013 | 420 | 2 | 21 | High | Yes | 13 |
13 | 2007 | 170 | 3 | 28 | High | Yes | 8 |
14 | 2007 | 100 | 7 | 28 | Medium | Yes | 3 |
15 | 2008 | 100 | 7 | 28 | Medium | Yes | 5 |
16 | 2010 | 230 | 3 | 28 | Medium | Yes | 9 |
17 | 2013 | 700 | 1 | 21 | High | Yes | 10 |
18 | 2014 | 240 | 4 | 21 | Medium | Yes | 8 |
19 | 2014 | 250 | 4 | 21 | High | Partially | 10 |
20 | 2012 | 300 | 2 | 21 | High | Yes | 10 |
21 | 2007 | 300 | 3 | 28 | High | No | 10 |
22 | 2009 | 210 | 3 | 28 | High | Yes | 6 |
23 | 2013 | 250 | 4 | 21 | Medium | Yes | 8 |