Table 5.
Differences in recovery of M. haemolytica, P. multocida, and H. somni at 13DOF between years and metaphylaxis administered (year 2020/tulathromycin, year 2021/tulathromycin, and year 2021/oxytetracycline), reported as population-averaged odds ratios (ORs) and 95% confidence intervals (CIs), accounting for clustering at the pen level. n = 1596 calves.
| Bacteria | Year/Metaphylaxis Comparison | OR | 95% CI | p-Value |
|---|---|---|---|---|
| M. haemolytica | 2021/tulathromycin vs. 2020/tulathromycin |
0.4 | 0.1, 1.3 | 0.12 |
| 2021/oxytetracycline vs. 2020/tulathromycin |
1.2 | 0.3, 4.0 | 0.82 | |
| 2021/oxytetracycline vs. 2021/tulathromycin |
3.1 | 0.7, 13 | 0.12 | |
| P. multocida | 2021/tulathromycin vs. 2020/tulathromycin |
1.2 | 0.6, 2.4 | 0.55 |
| 2021/oxytetracycline vs. 2020/tulathromycin |
5.5 | 2.9, 9.3 | <0.001 | |
| 2021/oxytetracycline vs. 2021/tulathromycin |
4.4 | 2.1, 9.3 | <0.001 | |
| H. somni | 2021/tulathromycin vs. 2020/tulathromycin |
2.6 | 0.6, 2.4 | 0.06 |
| 2021/oxytetracycline vs. 2020/tulathromycin |
3.3 | 1.2, 3.7 | 0.018 | |
| 2021/oxytetracycline vs. 2021/tulathromycin |
1.3 | 0.4, 3.7 | 0.67 |