Table 1.
The titres of anti-Mannheimia haemolytica specific antibodies in experimental and control calves from the 1st to 12th week of the animal life.
| Weeks of animal life | Animals | |
|---|---|---|
| Exp | Control | |
| 1 | >12.60 ± 0.00* | 10.12 ± 0.52 |
| 2 | >12.60 ± 0.00* | 11.13 ± 0.79 |
| 3 | >12.60 ± 0.00* | 9.40 ± 0.91 |
| 4 | >12.50 ± 0.10* | 9.78 ± 0.46 |
| 5 | >12.15 ± 0.59* | 9.40 ± 0.36 |
| 6 | 12.28 ± 0.28* | 9.12 ± 0.41 |
| 7 | >10.83 ± 0.99* | 8.57 ± 1.23 |
| 8 | >11.90 ± 0.48* | 9.37 ± 1.29 |
| 9 | 11.47 ± 0.67* | 8.40 ± 0.68 |
| 10 | 11.03 ± 0.33* | 9.08 ± 0.65 |
| 11 | 10.40 ± 0.78* | 8.70 ± 0.36 |
| 12 | 10.30 ± 0.55* | 8.60 ± 0.36 |
*Significant differences (p < 0.05) within the two groups of calves. Exp, experimental calves; Control, control calves. The results are expressed as 2LOG (the mean values ± standard deviations).