Table 5.
Significant effect of several practices on percentage of herds affected by S. aureus, E. coli, and other coliforms in bulk tank milk using multivariable logistic regression models
| Model for: | Practice (independent variable) | Positive herds without practice | Positive herds with practice (%) | P valuea |
|---|---|---|---|---|
| S. aureus (Whole model: P < 0.001) | High hygiene during milking | 74.2 % (49/66) | 29.4 % (17/34) | 0.007 |
| Hot water use | 69.8 % (44/63) | 40.5 % (15/37) | 0.04 | |
| Official milk control implementation | 66.3 % (53/80) | 30.0 % (6/20) | 0.03 | |
| Milking mastitic cows at the end | 67.2 % (41/61) | 46.2 % (18/39) | 0.04 | |
| Abrupt cessation of milking | 67.4 % (31/46) | 51.9 % (28/54) | 0.04 | |
| Coliformsb (Whole model: P < 0.001) | Glove use | 40.7 % (33/81) | 10.5 % (2/19) | 0.05 |
| Hot water use | 46.0 % (29/63) | 16.2 % (6/37) | 0.01 | |
| Calf suck its dam | 41.8 % (28/67) | 21.2 % (7/33) | 0.02 |
aNo significant interactions between factors (independent variables) were observed (P > 0.05)
bColiform bacteria: Klebsiella oxytoca, Klebsiella pneumoniae, and Serratia marcescens