Table 2.
Parameter symbols, values, and sources used in the economic model for the cost of bovine tuberculosis control in a US cow-calf herd.
| Parameter | Description | Value | Source |
|---|---|---|---|
| A | Skin test administration cost | $7.13/cow (5.77,11.33) | (Buhr et al., 2009) |
| M | Miles traveled by veterinarian | 50 miles (40,60) | Assumed |
| MR | Mileage rate | $0.55/mile (0.445,0.585) | IRS (Internal Revenue Service, 2008) |
| Ptrace | Probability of successfully tracing an animal detected at slaughter back to its source herd | 0.33 (0.33,0.85) | (Wolf et al., 2008) |
| pPCR | Price of PCR test | $271.25/animal (217,325.50) | (USAHA, 2004) |
| Salv | Salvage value of an adult cull animal | $80.00/cwt | USDA (National Agricultural Statistics Service and Agricultural Statistics Board, 2012) |
| Wt | Average salvage weight of an adult cull animal | 1287 lbs (1250,1324) | USDA (USDA:NASS, 2007) |
| SpCFT | Specificity of caudal fold test | 0.968 (0.755–0.99) | (de la Rua-Domenech et al., 2006) |
| SpCCT | Specificity of comparative cervical test | 0.995 (0.788–1) | (de la Rua-Domenech et al., 2006) |
| SeCFT | Sensitivity of caudal fold test to infectious or reactor cattle | 0.839 (0.632–1) | (de la Rua-Domenech et al., 2006) |
| SeCCT | Sensitivity of comparative cervical test | 0.935 (0.75–0.955) | (de la Rua-Domenech et al., 2006) |
| Sepm | Sensitivity of typical post-mortem inspection to infectious or reactor cattle | 0.55 (0.285–0.95) | (Asseged et al., 2004) |
| SePCR | Sensitivity of enhanced post- mortem inspection to infectious or reactor cattle | 1 (0.8–1) | assumed |
| β | Transmission rate | 0.01/year (0.004–0.028) | (Barlow et al., 1997) |
| γ | Progression rate, latent to reactor | 8.32 /year (8.32–26.07) | (Kao et al., 1997) |
| η | Progression rate, reactor to infectious | 0.347 /year (0.347–4.06) | (Kao et al., 1997) |
| μd | annual replacement rate | 0.17 (0.136–0.2) | assumed |
| disposal | Cost to dispose of infected carcasses | $75 (60–90) | |
| disinfect | Cost to disinfect a farm premises after depopulation | $400 (320–480) | (Wolf et al., 2008) |
| shipping | Cost to ship replacement cattle | $0.08/cow/mile (0.06–0.10) | (Beutler, n.d.) |
| distance | Distance replacement cattle are shipped | 75 miles (60–90) | assumed |