Table 2.
Number and percentage of seropositive or seronegative calves at 3 weeks after the booster dose
| First Experiment | Second Experiment | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| +2 | +3 | +4 | Cont. | 7–12 | 5–6 | High | Low | 1+4 | 2+4 | 3+4 | High | Low | ||
| H. somni | Positive | 19 | 14 | 19 | 3 | 36 | 16 | - | - | 10 | 10 | 8 | - | - |
| 90.5% | 87.5% | 100% | 20.0% | 90.0% | 100% | - | - | 100% | 91.0% | 80.0% | - | - | ||
| Negative | 2 | 2 | 0 | 12 | 4 | 0 | - | - | 0 | 1 | 2 | - | - | |
| 9.5% | 12.5% | 0.0% | 80.0% | 10.0% | 0.0% | - | - | 0.0% | 9.0% | 20.0% | - | - | ||
| P. multocida | Positive | 20 | 16 | 19 | 9 | 39 | 16 | 25 | 14 | 10 | 11 | 10 | 18 | 13 |
| 92.5% | 100% | 100% | 60.0% | 97.5% | 100% | 100% | 93.3% | 100% | 100% | 100% | 100% | 100% | ||
| Negative | 1 | 0 | 0 | 6 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | |
| 4.8% | 0.0% | 0.0% | 40.0% | 2.5% | 0.0% | 0.0% | 6.7% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | ||
| M. haemolytica | Positive | 11 | 10 | 12 | 0 | 29 | 4 | 18 | 11 | 6 | 2 | 1 | 5 | 4 |
| 52.4% | 62.5% | 63.2% | 0.0% | 72.5% | 25.0% | 85.7% | 57.9% | 60.0% | 18.0% | 10.0% | 45.5% | 20.0% | ||
| Negative | 10 | 6 | 7 | 15 | 11 | 12 | 3 | 8 | 4 | 9 | 9 | 6 | 16 | |
| 47.6% | 37.5% | 36.8% | 100.0% | 27.5% | 75.0% | 14.3% | 42.1% | 40.0% | 82.0% | 90.0% | 54.5% | 80.0% | ||
Titres more than 0.604 for H. somni, 100 for P. multocida, or 200 for M. haemolytica were considered antibody positive. 7–12: 7–12 day group; 5–6: 5–6 day group; High: P. multocida or M. haemolytica high maternal antibody group; Low: P. multocida or M. haemolytica low maternal antibody group