Table 2 Results of the multivariable regression for the probability of a French traditional free-range broiler flock to receive an antimicrobial treatment (cases, n = 52) compared to no antimicrobial treatment (controls, n = 208) up to 42 days of age, as adjusted by the farmer organizations, in 2016
Variable | No. flocks | Odds Ratio | 95% CI | p-value |
|---|---|---|---|---|
Use of chicken paper topped with starter feed | ||||
Yes | 213 | 0.29 | 0.09–0.87 | 0.027 |
No | 47 | Reference | ||
Use of herbal drugs as a preventive measure | ||||
Yes | 37 | 0.09 | 0.01–0.49 | < 0.01 |
No | 223 | Reference | ||
Thickness of the litter | ||||
10 cm or less | 62 | 0.22 | 0.06–0.80 | 0.021 |
11–15 cm | 81 | 1.19 | 0.43–3.28 | 0.730 |
15 cm or greater | 117 | Reference | ||
Cleaning and disinfection of the concrete perimeter of the poultry house at the previous downtime | ||||
Yes | 154 | 3.43 | 1.28–9.22 | 0.014 |
No | 106 | Reference | ||
Perception of the mortality rate at 10 days | ||||
High | 83 | 58.71 | 9.56–372.26 | < 0.01 |
Normal | 103 | 10.15 | 1.75–58.97 | 0.010 |
Low | 74 | Reference | ||
Farmer reported a health problem between 11 and 42 days | ||||
Yes | 49 | 12.47 | 4.21–36.91 | < 0.01 |
No | 211 | Reference | ||
Phone call between the farmer and production technician between 11 and 42 days | ||||
Yes | 109 | 5.87 | 2.32–14.85 | < 0.01 |
No | 151 | Reference | ||