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Differences in recovery of M. haemolytica, P. multocida, and H. somni at arrival to feedlot and prior to metaphylaxis administration (1DOF) between year 2021 and year 2020, reported as population-averaged odds ratios (ORs) and 95% confidence intervals (CIs), accounting for clustering at the pen level. n = 1599 calves.
| Bacteria | OR 2021 vs. 2020 | 95% CI | p-Value |
|---|---|---|---|
| M. haemolytica | 1.9 | 1.3, 2.8 | <0.001 |
| P. multocida | 0.6 | 0.3, 0.97 | 0.04 |
| H. somni | 0.7 | 0.4, 1.5 | 0.42 |
