Table 2.
The prevalence of mastitis based on the intrinsic risk factors
| Intrinsic risk factors | Total animals examined | Positive animals (%) | prevalence | χ2 | p value |
|---|---|---|---|---|---|
| Breed | |||||
| Local | 74 | 29(39.2) | 7.55 | 23.3 | 0.000 |
| Crossbreed | 310 | 213(68.7) | 55.47 | ||
| Age | |||||
| Young adult | 96 | 50 (52.1) | 13.02 | 17.3 | 0.002 |
| Adult | 137 | 78 (56.9) | 20.31 | ||
| Old | 151 | 114 (75.5) | 29.69 | ||
| Parity | |||||
| Few | 201 | 89 (44.3) | 23.18 | ||
| Moderate | 65 | 40 (61.5) | 10.42 | 88.1 | 0.000 |
| Many | 118 | 113 (95.8) | 29.43 | ||
| lactation stage | |||||
| Early | 206 | 135 (65.5) | 35.16 | 6.2 | 0.185 |
| Middle | 95 | 50 (52.6) | 13.02 | ||
| Late | 83 | 57 (68.7) | 14.84 | ||
| Total | 384 | 242 | 63.02 | ||