Table 5.
Summary of the terms for Escherichia coli clinical mastitis in the final lactation model
| Confidence interval |
|||||
|---|---|---|---|---|---|
| Variable | Coefficient | SE | Odds ratio | 2.5% | 97.5% |
| Quarter case of E. coli clinical mastitis before the next visit | |||||
| Parity 1 (reference = parity 2 and above) | −0.838 | 0.295 | 0.43 | 0.24 | 0.78 |
| Lactation mo 1 | 1.312 | 0.295 | 3.71 | 2.06 | 6.70 |
| Lactation mo 2 | 0.828 | 0.33 | 2.29 | 1.18 | 4.43 |
| Lactation mo 3 | 0.778 | 0.333 | 2.18 | 1.12 | 4.24 |
| Lactation mo 4 | 1.049 | 0.303 | 2.85 | 1.56 | 5.23 |
| Lactation mo 5 | 0.537 | 0.354 | 1.71 | 0.84 | 3.47 |
| Lactation mo 6 (reference = mo 7 and above) | 1.122 | 0.294 | 3.07 | 1.70 | 5.53 |
| TEC1 2B | 0.721 | 0.308 | 2.06 | 1.11 | 3.81 |
| TEC 2C2 | 0.217 | 0.520 | 1.24 | 0.44 | 3.51 |
| TEC 2D (reference = TEC N to 2A) | 1.794 | 0.427 | 6.01 | 2.56 | 14.13 |
| UHS3 3 and 42 (reference = UHS 1 and 2) | 0.446 | 0.242 | 1.56 | 0.96 | 2.53 |
1
Teat-end callosity score: N = normal teat end; 1A = thin smooth callosity ring; 1B = moderate smooth callosity ring; 1C = thick smooth callosity ring; 2A = thin rough callosity ring; 2B = moderate rough callosity ring; 2C = thick rough callosity ring; 2D = extreme rough callosity ring (severe hyperkeratosis of the teat end).
2
These covariates were nonsignificant at the 95% level but displayed a strong trend.
3
Udder hygiene score: 1 = completely free or very little dirt; 2 = slightly (2-10% of the area) covered in dirt; 3 moderately (10-30% of the area) covered in dirt; 4 = covered (>30% of the area) with caked-on dirt.