Table 3.
Definitions of animal health variables used in a study to compare 2 vaccination programs in feedlot calves at ultra-high risk of developing undifferentiated fever (UF)/bovine respiratory disease (BRD)
| Animal health variable | Definition |
|---|---|
| Initial UF treatment rate | (number of animals initially treated for UF) ÷ (the number of animals allocated) ×100% |
| First UF relapse rate | (number of first UF relapses) ÷ (the number of animals initially treated for UF) × 100% |
| Initial NF treatment ratea | (number of animals initially treated for NF) ÷ (the number of animals allocated) × 100% |
| First NF relapse ratea | (number of first NF relapses) ÷ (the number of animals initially treated for NF) × 100% |
| Overall chronicity rate | (number of animals designated as chronic) ÷ (the number of animals allocated) ×100% |
| Overall wastage rate | (number of animals designated as chronic that did not die) ÷ (the number of animals allocated) × 100% |
| Overall mortality rate | (number of mortalities due to all causes) ÷ (the number of animals allocated) × 100% |
| BRD mortality rate | (number of mortalities due to BRD) ÷ (the number of animals allocated) |
| Histophilosis mortality rateb | (number of mortalities due to histophilosis) ÷ (the number of animals allocated) × 100% |
| Metabolic mortality rate | (number of mortalities due to metabolic disease) ÷ (the number of animals allocated) × 100% |
| Arthritis mortality rate | (number of mortalities due to arthritis) ÷ (the number of animals allocated) × 100% |
| Miscellaneous mortality rate | (number of mortalities due to causes other than BRD, histophilosis, metabolic disease, or arthritis) ÷ (the number of animals allocated) × 100% |
a
NF — no fever
b
Histophilosis — disease due to Histophilus somni infection