Table II.
Distribution of the continuous variables in each production phase that were considered as possible risk factors for the occurrence of Salmonella in 10 farrow-to-finish pig farms from Alberta and Saskatchewan
| Variable | Production phase | Mean | Median | Minimum | Maximum | s | n |
|---|---|---|---|---|---|---|---|
| Age in weeksa | Nursery | 6.6 | 7 | 3 | 11 | 2 | 236 |
| Grow-finish | 16.6 | 16 | 8 | 27 | 4.7 | 255 | |
| Number of pigs in penb | Sows | 5.3 | 6 | 1 | 10 | 2.7 | 39 |
| Nursery | 18.8 | 18 | 6 | 70 | 9.8 | 255 | |
| Grow-finish | 16.4 | 14 | 3 | 120 | 12.9 | 295 | |
| Pig density (m2 per pig)b | Sows | 2.3 | 2.25 | 0.75 | 4.3 | 1.1 | 39 |
| Nursery | 0.25 | 0.25 | 0.1 | 0.53 | 0.08 | 255 | |
| Grow-finish | 0.85 | 0.74 | 0.15 | 3.12 | 0.47 | 295 |
s — standard deviation.
a
Observations on age were not recorded for breeding females.
b
Data from pigs in pens only; does not include observations from sows in gestation/farrowing crates (n = 161).