Clinical signs scores of four groups
| Group | Score | |||
| 0 | 1 | 2 | 3 | |
| A group | 0 | 0 | 5 | 5 |
| B group | 0 | 2 | 7 | 1 |
| C group | 0 | 5 | 5 | 0 |
| D group | 2 | 6 | 2 | 0 |
Ridit analysis was used to analyse the differences between the data of clinical signs scores of four groups,9 where p<0.05 was regarded as significant.