|  | Period 2(experimental period) | Period 3(control period) | P [χ 2 ] |
---|---|---|---|---|
Before drying-off | Cow/glands | 92/368 | 83/332 | NS |
 | Uninfected | 326/368 (88.6) | 274/332 (82.5) | NS |
 | Infected | 42/368 (11.4) | 58/332 (17.5) | NS |
Postpartum | Uninfected1 | 312/326 (95.7) | 259/274 (94.5) | NS |
 | Subclinical2 | 14/326 (4.3) | 15/274 (5.5) | NS |
 | Clinical3 | 28/326 (8.6) | 20/274 (7.3) | NS |
 | Cured4 | 31/42 (73.8) | 30/58 (51.7) | 0.025 |
 | Not Cured 5 | 11/42 (26.2) | 28/58 (48.3) | 0.025 |