Table 5.
Risk factors for prevalence of Staphylococcus aureus in milk.
| Risk factors | Total samples examined | No of samples positive (%) | χ2 | P-value |
|---|---|---|---|---|
| Area | ||||
| Mukaturi | 78 | 17 (21.8) | 4.424 | 0.035 |
| Sululta | 105 | 11 (10.5) | ||
| Age | ||||
| Young (≥3-5) | 59 | 6 (10.2) | 16.201 | ≤0.001 |
| Adult (>6- ≥9) | 101 | 12 (11.9) | ||
| Old (>9) | 23 | 10 (43.5) | ||
| Management system | ||||
| Intensive | 105 | 11 (10.5) | 4.424 | 0.035 |
| Semi-intensive | 78 | 17 (21.8) | ||
| Parity level | ||||
| Few (1-2 calves) | 56 | 3 (5.4) | 17.895 | ≤0.001 |
| Mid (3-4 calves) | 107 | 16 (15) | ||
| Many (>4 calves) | 20 | 9 (45) | ||
| Lactation stage | ||||
| Early (<3 moths) | 60 | 8 (13.3) | 1.131 | 0.568 |
| Mid (3-6 moths) | 101 | 15 (14.9) | ||
| Late (>6 moths) | 22 | 5 (22.7) | ||
| Body condition scour | ||||
| Poor | 7 | 3 (42.9) | 4.286 | 0.117 |
| Modern | 146 | 21 (14.4) | ||
| Good | 30 | 4 (13.3) | ||
| Drainage condition of milking area: | ||||
| Poor | 104 | 21 (20.2) | 4.448 | 0.035 |
| Good | 79 | 7 (8.9) |