Table 5.
Risk factors associated with the prevalence level of MAP excretion within infected herds
| Variables | OR 1 | 95% CI 2 | p-value |
|---|---|---|---|
| All herds |
|
|
|
| Direct contamination of heifer area3 |
1.94 |
1.12-3-33 |
0.017 |
| Heifers kept in the same building as cows |
1.79 |
1.02-3.17 |
0.044 |
| Direct contamination of heifer water supply4 |
3.00 |
1.61-5.59 |
0.0005 |
| Calving pen used as sick cow pen |
0.47 |
0.26-0.87 |
0.017 |
| Dairy herds |
|
|
|
| Direct contamination of heifer area3 |
2.40 |
1.18-4.88 |
0.016 |
| Direct contamination of heifer water supply4 |
2.99 |
1.44-6.22 |
0.003 |
| Heifers kept on contaminated pastures5 |
2.43 |
1.09-5.43 |
0.030 |
| Type of calving pen6 |
2.11 |
1.07-4.15 |
0.031 |
| Calving pen used as sick cow pen |
0.33 |
0.16-0.71 |
0.004 |
| Cleaning calving pen with high-pressure washer > 1x/year |
2.13 |
1.07-4.26 |
0.031 |
| Animal purchase7 |
0.51 |
0.26-0.99 |
0.048 |
| Beef herds |
|
|
|
| No significant factors |
1OR = odds ratio.
295% CI = 95% confidence interval.
3Farms where direct contamination of the heifer area by manure spilling from adult animals could happen compared to farms where such contamination was not possible.
4Farms where direct contamination of the water supply of the heifers by manure spilling from adult animals could happen compared to farms where such contamination was not possible.
5Pastures contaminated through pasturing of cows or slurry spread earlier in season.
6No calving pen in free stall or boxes as in free stalls associated with higher prevalence than box with deep straw bedding and calving in tethered stable.
7Farms that purchased two or more animals per year on average compared to farms that purchased up to one animal per year on average.