Table 4.
Univariable logistic regression analysis of the association of cow-level mastitis with different risk factors
| Variable | Number | No. pos | Prevalence (%) | p |
|---|---|---|---|---|
| Management type | <0.001 | |||
| Semi-intensive | 200 | 92 | 46.0 | |
| Intensive | 329 | 239 | 72.6 | |
| Herd size | <0.001 | |||
| ≤ 10 | 200 | 92 | 46.0 | |
| > 10 | 329 | 239 | 72.6 | |
| Bedding material | <0.001 | |||
| Yes | 145 | 61 | 42.1 | |
| No | 384 | 270 | 70.3 | |
| Udder washing | 0.707 | |||
| Whole udder | 291 | 180 | 61.9 | |
| Teats only | 238 | 151 | 63.5 | |
| Udder drying after washing | 0.774 | |||
| Yes | 295 | 183 | 62.0 | |
| No | 234 | 148 | 63.3 | |
| Milking mastitic cow last | 0.001 | |||
| Yes | 202 | 109 | 54.0 | |
| No | 327 | 222 | 67.9 | |
| Breed | <0.001 | |||
| Local | 83 | 33 | 39.8 | |
| Cross | 446 | 298 | 66.8 | |
| Age | <0.001 | |||
| ≤ 5 years | 227 | 85 | 37.4 | |
| > 5 years | 302 | 246 | 81.5 | |
| Parity | <0.001 | |||
| 1 | 66 | 17 | 25.8 | |
| 2 | 145 | 60 | 41.4 | |
| 3 | 115 | 75 | 65.2 | |
| ≥ 4 | 203 | 179 | 88.2 | |
| Stage of lactation | <0.001 | |||
| 1 – 2 months | 198 | 158 | 79.8 | |
| 3 – 6 months | 186 | 80 | 43.0 | |
| ≥ 7 months | 145 | 93 | 64.1 | |
| Udder & leg hygiene score | <0.001 | |||
| Slightly dirty | 241 | 120 | 49.8 | |
| Moderately dirty | 203 | 136 | 67.0 | |
| Very dirty | 85 | 75 | 88.2 | |
| Udder position | <0.001 | |||
| Normal | 315 | 162 | 51.4 | |
| Pendulous | 214 | 169 | 79.0 | |
| Teat end shape | <0.001 | |||
| Pointed | 175 | 74 | 42.3 | |
| Round | 197 | 126 | 64.0 | |
| Flat | 157 | 131 | 83.4 | |
| History of mastitis | 0.174 | |||
| No | 189 | 111 | 58.7 | |
| Yes | 340 | 220 | 64.7 |