Table 2.
Production data from 20 Swedish pig herds with (case herds) and without (control herds) a history of Streptococcus suis-infections in grower pigs
| Production parameters | Sweden 2017a | Control herds | Case herds | P value | ||||
|---|---|---|---|---|---|---|---|---|
| Mean | n | Mean | SD | n | Mean | SD | ||
| Sows in productionb | 354 | 9 | 223.1 | 178.8 | 7 | 424.3 | 345.9 | 0.15 |
| Sows farrowing per batch | n/a | 10 | 28.7 | 14.2 | 10 | 39.3 | 14.8 | 0.12 |
| Litters/sow/yearb | 2.24 | 6 | 2.12 | 0.27 | 6 | 2.20 | 0.06 | 0.49 |
| Piglets born alive/litter | 14.3 | 7 | 14.0 | 0.9 | 8 | 14.5 | 0.7 | 0.34 |
| Pigs weaned/litterc | 11.9 | 7 | 11.3 | 1.1 | 8 | 11.9 | 0.7 | 0.22 |
| Pigs weaned/sow/yearb | 26.6 | 6 | 24.0 | 4.6 | 6 | 26.6 | 1.4 | 0.24 |
| Age at weaning (days) | 32.8 | 10 | 36.0 | 4.2 | 10 | 33.2 | 3.3 | 0.11 |
| Gilt recruitment (%) | 24.8 | 9 | 25.7 | 9.5 | 8 | 29.0 | 5.5 | 0.40 |
| Farrowing interval (weeks) | n/a | 10 | 3.4 | 1.7 | 10 | 2.5 | 1.1 | 0.18 |
All data parameters were not available for all herds (n = number of herds included)
aMean values for Sweden according to the InterPIG report 2018 [49]
bSow pools not included
cNurse sows were used in one of the control herds and six of the case herds