Covariates | Reference | |
---|---|---|
1 | Herd size | |
2 | Testing frequency | [29] |
3 | Soil type (texture) | [22] |
4 | Soil pH | |
5 | Soil hydrologic characteristics i.e. run-off potential | |
6 | Agroecological zone (Montane/Boreal forest/Grassland/Parkland) | [39] |
7 | Participating the USDA Voluntary Johne’s Disease Herd Status Program i.e. VJDHSP (n = 24) | |
8 | Spatial dependence: Presence of neighboring dairy farms | [44] |