Table 3.
Association between farm characteristics and husbandry and the CRB prevalence.
| Farm characteristics | Average | SD | Min | Max | ORa | P-value | 95% CI | |
|---|---|---|---|---|---|---|---|---|
| Total acres in farm | 5930 | 684 | 20 | 90000 | 0.999 | 0.248 | 0.999 | 1.000 |
| Total number of cattle | 578 | 29 | 20 | 3600 | 0.999 | 0.119 | 0.999 | 1.000 |
| Survey Items | Response | (n) | propb (%) | prevc (%) | OR | P-value | 95% CI | |
| Farming type | Small/medium | 251 | 29.9 | 39.4 | ref | – | – | – |
| Large | 589 | 70.1 | 50.8 | 1.580 | 0.003 | 1.172 | 2.137 | |
| Animal Husbandry | Response | (n) | propb (%) | prevc (%) | OR | P value | 95% CI | |
| How many times per month are drinking troughs cleaned? | Never | 630 | 75.0 | 50.2 | Ref | – | – | – |
| More than once | 42 | 5.0 | 21.4 | 0.271 | 0.001 | 0.128 | 0.576 | |
| Once | 87 | 10.4 | 36.8 | 0.578 | 0.020 | 0.364 | 0.918 | |
| Less than once | 81 | 9.6 | 50.6 | 1.018 | 0.938 | 0.641 | 1.617 | |
| Cleaning product used for trough cleaning? | None | 743 | 88.5 | 50.3 | Ref | – | – | – |
| Bleach | 97 | 11.6 | 24.7 | 0.324 | <0.001 | 0.200 | 0.526 | |
| Do you supplement ionophores into feed? | No | 625 | 74.4 | 49.4 | Ref | – | – | – |
| Yes | 215 | 25.6 | 41.4 | 0.722 | 0.042 | 0.528 | 0.988 | |
| Biosecurity | Response | (n) | propb (%) | prevc (%) | OR | P-value | 95% CI | |
| Isolation/quarantine for new animals? | No | 66 | 7.7 | 68.2 | Ref | – | – | – |
| Yes | 774 | 92.1 | 45.6 | 0.391 | <0.001 | 0.229 | 0.669 | |
| How do you dispose of dead animals? | Bury | 542 | 64.5 | 41.5 | Ref | – | – | – |
| Decompose | 298 | 35.5 | 58.1 | 1.940 | <0.001 | 1.464 | 2.597 | |
aWithin each survey item, OR was compared with the first type of response. bProportion of animal samples in each survey response item group (%). cPrevalence of CRB in samples linked to survey response item group (%).