Table 2. Univariate analysis with the distribution of the possible risk factors associated with positivity in the AAT test in the state of Ceará.
| Variable | No. of herds | Positive (N / %) | P |
|---|---|---|---|
| Breed | |||
| Purebred | 1 | 1 (100.0) | 0.364 |
| Mixed | 32 | 11 (34.4) | |
| Cleaning frequency | |||
| Daily | 2 | 0 (0.0) | 0.543 |
| Weekly | 5 | 2 (40.0) | |
| Occasionally | 26 | 10 (38.5) | |
| Veterinary Assistance | |||
| Yes | 10 | 3 (30.0) | 0.710 |
| No | 23 | 9 (39.1) | |
| Main source of income | |||
| Cattle farming | 27 | 8 (29.6) | 0.159* |
| Other activities | 6 | 4 (66.6) | |
| Herd size | |||
| Up to 80 animals | 22 | 9 (40.9) | 0.703 |
| > 80 animals | 11 | 3 (27.3) | |
| Breeding system | |||
| Extensive | 28 | 10 (35.7) | 1.000 |
| Semi-confinement | 5 | 2 (40.0) | |
| Contact with other herds | |||
| Yes | 16 | 8 (50.0) | 0.157* |
| No | 17 | 4 (23.5) | |
| Purchase of new breeders | |||
| Yes | 25 | 9 (36%) | 1.000 |
| No | 8 | 3 (37.5) | |
| Rental of pasture areas | |||
| Yes | 18 | 6 (33.3) | 0.731 |
| No | 15 | 6 (40.0) | |
| Existence of parturition areas | |||
| Yes | 6 | 3 (50.0) | 0.643 |
| No | 27 | 9 (33.3) | |
| Destination of carcasses | |||
| Buried | 7 | 1 (14.3) | 0.377 |
| Burned | 11 | 5 (45.4) | |
| Open-sky | 15 | 6 (40.0) |
*
Variables selected for multivariate analysis. Five properties that vaccinated against brucellosis were removed from the risk factor analysis.