Table 1 Distribution and univariable analysis of herd characteristics in 42 herds experiencing neonatal porcine diarrhoea (NPD herds) and 56 herds with no or occasional cases (non-NPD herds)
Variablea | NPD herds n (%) | Non-NPD herds n (%) | P valueb |
|---|---|---|---|
Building or renovation of stables used as farrowing units | 0.05d | ||
Earlier than 1990 | 3 (7) | 11 (20) | |
1990–2000 | 7 (17) | 18 (32) | |
Varies between units | 12 (29) | 10 (18) | |
Later than 2000 | 20 (48) | 17 (30) | |
Number of sows in production | <0.01c | ||
<200 | 20 (48) | 44 (79) | |
>200 | 22 (52) | 12 (21) | |
Batch size | <0.01c | ||
<20 | 6 (14) | 23 (41) | |
20–34 | 9 (21) | 16 (29) | |
>34–46 | 12 (29) | 11 (20) | |
>46 | 15 (36) | 6 (11) | |
Recording of production results | 0.02d | ||
Yes | 40 (95) | 44 (79) | |
No | 2 (5) | 12 (21) | |
Level of gilt recruitment | 0.18c | ||
<30% | 9 (21) | 18 (32) | |
30–40% | 10 (24) | 19 (34) | |
>40% | 16 (39) | 11 (20) | |
Unknown | 7 (17) | 8 (14) |