Table 5.
Summary of baseline data collected in a study to compare 2 vaccination programs in feedlot calves at ultra-high risk of developing undifferentiated fever/bovine respiratory disease
| Experimental group | ||||
|---|---|---|---|---|
| Baseline variable | MLV3-BT2a | MLV4-BT1b | Sx̄c | P-value |
| Initial weight [lb (kg)]c | 642.7 (291.5)f | 644.5 (292.3)f | 0.7 (0.3) | 0.140 |
| Steers (%)d | 75.96 | 76.12 | 0.91 | 0.902 |
| Hip height [in (cm)]e | 46.06 (116.99) | 46.10 (117.09) | 0.02 (0.05) | 0.104 |
Animals in the MLV3-BT2 group received a modified-live viral vaccine containing infectious bovine rhinotracheitis virus (IBRV), type I and II bovine viral diarrhea virus (BVDV), and a Mannheimia haemolytica (MH) and Pasteurella multocida (PM) bacterin-toxoid [Express 3 and Pulmo-guard PHM-1; respectively, Boehringer Ingelheim (Canada) Burlington, Ontario]. There were 6 pens and 1942 animals in the MLV3-BT2 group
Animals in the MLV4-BT1 group received a modified-live viral vaccine containing IBRV, type I BVDV, bovine respiratory syncytial virus, and parainfluenza-3 virus and a MH bacterin-toxoid (Bovi-Shield 4 and One Shot; respectively, Pfizer Animal Health, Pfizer Canada, Kirkland, Quebec). There were 6 pens and 1940 animals in the MLV4-BT1 group
The standard error of the mean calculated from the analysis of variance
Initial weight for each pen was calculated as the summation of the individual animal initial weights, corrected for the shrink from purchase to arrival at the feedlot
Steers is the average proportion of steers in each pen
Numbers presented for each group are least squares means from the analysis of variance