Table 1.
Performance data and prevalence of postweaning multisystemic wasting syndrome (PMWS) in finishing pigs for year 2004 and first 8 mo of 2005a in Quebec farrow-to-finish and finishing herds
| % of herds
|
||||||||
|---|---|---|---|---|---|---|---|---|
| Type and size of herds | n | Average number of marketed pigs/herd/year | Response rate (%) | Mortality (%) 2004 mean sb | Mortality (%) 2005 mean, sb | PMWS + veb | PMWS−ve | PMWS unknown |
| Farrow-to-finish (number of sows) | ||||||||
| < 150 sows | 69 | 2080 | 87.5 | 5.49c, s = 7.35 | 7.69c, s = 7.72 | 34c | 32 | 34 |
| 150–300 sows | 77 | 3996 | 68.7 | 5.05c, s = 3.68 | 7.71c, s = 6.02 | 56d | 26 | 18 |
| > 300 sows | 22 | 9262 | 56.4 | 5.64c, s = 8.12 | 6.39c, s = 5.05 | 63d | 27 | 10 |
| Subtotal | 168 | 3888 | 73.2 | 5.31, s = 6.07 | 7.53, s = 6.67 | 48 | 28 | 24 |
| Finishing (number of marketed pigs/year) | ||||||||
| < 3000 | 33 | 1931 | 86.8 | 4.28c, s = 2.34 | 6.62c, s = 3.97 | 61c | 12 | 27 |
| 3000–6000 | 22 | 4117 | 66.7 | 4.24cd, s = 1.87 | 8.79cd, s = 6.02 | 82cd | 13 | 5 |
| > 6000 | 21 | 9610 | 77.8 | 6.48d, s = 4.59 | 8.13d, s = 4.66 | 90d | 10 | 0 |
| Subtotal | 76 | 4686 | 77.6 | 4.88, s = 3.15 | 7.66, s = 4.85 | 75 | 12 | 13 |
| Total (1 013 208 marketed pigs/year) | 244 | 4136 | 74.5 | 5.18, s = 5.34 | 7.57, s = 6.15 | 56 | 23 | 21 |
a
Significant difference in mortality between year 2004 and first 8 mo of 2005 at P < 0.01
b
Within a specific type of herds, different superscripts
(c,d)
within a column indicate significant difference (P < 0.05)
s = standard deviation