Table 4.
Class membership and item response probabilities (±SE) for animals assigned to each of 3 BRD outcome groups defined by the LCA based on 16 indicators of BRD in feedlot cattle
| Latent class | |||
|---|---|---|---|
| BRD indicator | 1 (non-BRD) 52% |
2 (mild BRD) 40% |
3 (severe BRD) 8% |
| Visual signs score > 0 | 0.01 (±0.017) | 0.98 (±0.023) | 0.94 (±0.054) |
| >1 BRD treatment | 0.00 (±0.002) | 0.19 (±0.053) | 0.94 (±0.105) |
| Rectal` temperature ≥40 °C | 0.09 (±0.025) | 0.53 (±0.053) | 0.73 (±0.107) |
| CALA score ≥ 2 | 0.42 (±0.042) | 0.87 (±0.036) | 0.79 (±0.093) |
| Lung consolidation ≥ 10% | 0.03 (±0.015) | 0.14 (±0.041) | 0.69 (±0.283) |
| Pleural lesions score 3 | 0.06 (±0.021) | 0.23 (±0.046) | 0.66 (±0.123) |
| BHV1 seronegative1 | 0.42 (±0.042) | 0.63 (±0.050) | 0.74 (±0.110) |
| BVDV seronegative1 | 0.28 (±0.039) | 0.33 (±0.049) | 0.59 (±0.134) |
| BRSV seronegative1 | 0.06 (±0.020) | 0.02 (±0.014) | 0.09 (±0.067) |
| BPI3 seronegative1 | 0.05 (±0.019) | 0.06 (±0.026) | 0.30 (±0.114) |
| BAdV seronegative1 | 0.12 (±0.028) | 0.08 (±0.028) | 0.19 (±0.091) |
| BHV1 positive2 | 0.00 (±0.001) | 0.23 (±0.043) | 0.04 (±0.069) |
| BVDV positive2 | 0.02 (±0.013) | 0.04 (±0.019) | 0.04 (±0.044) |
| BRSV positive2 | 0.02 (±0.012) | 0.01 (±0.010) | 0.17 (±0.083) |
| BPI3 positive2 | 0.00 (±0.0003) | 0.00 (±0.0003) | 0.04 (±0.042) |
| BCoV positive2 | 0.04 (±0.016) | 0.00 (±0.001) | 0.09 (±0.059) |
1Seronegative for BRD viruses = negative for the virus at both induction and time of the first BRD pull.
2Animals were positive or shedding the virus at the time of first BRD pull.