Table 6.
The median of mastitis total cost (USD/cow per year) in a herd of 200 dairy cows was obtained from the sensitivity analysis and the relative difference (%) with respect to model annual output (default input parameters).
| Parameters | Scenarios | ||||
|---|---|---|---|---|---|
| BASIC 3 | SEG 4 | CULL1 5 | CULL2 5 | CULL3 5 | |
| Default parameters | 88.60 | 43.60 | 90.82 | 114.24 | 84.30 |
| Transmission probability (β) | |||||
| 0.25 | 39.77 (↓55.1%) | 43.41 (↓0.4%) | 39.71 (↓56.3%) | 39.76 (↓65.2%) | 39.89 (↓52.7%) |
| 0.75 | 207.84 (↑134.6%) | 202.72 (↑365%) | 618.27 (↑580.8%) | 367.66 (↑221.8%) | 1129.49 (↑1239.8%) |
| Recovery probability from SM 1 case (ϒs) | |||||
| 0.68 | 39.50 (↓55.4%) | 42.52 (↓2.5%) | 39.52 (↓56.5%) | 39.51 (↓65.4%) | 39.52 (↓53.1%) |
| 0.06 | 159.25 (↑79.7%) | 48.12 (↑10.4%) | 386.05 (↑325.1%) | 277.70 (↑143.1%) | 122.71 (↑45.6%) |
| Recovery probability from CM 2 case (ϒc) | |||||
| 0.14 | 143.14 (↑61.6%) | 63.64 (↑46%) | 316.73 (↑248.7%) | 204.24 (↑78.8%) | 115.82 (↑37.4%) |
| 0.50 | 52.07 (↓41.2%) | 43.40 (↓0.5%) | 65.45 (↓27.9%) | 58.18 (↓49.1%) | 48.82 (↓42.1%) |
| Flare-up probability (from SM to CM case) | |||||
| 0.08 | 104.95 (↑18.5%) | 44.66 (↑2.4%) | 177.44 (↑95.4%) | 122.42 (↑7.2%) | 85.50 (↑1.4%) |
| 0.13 | 71.69 (↓19.1%) | 43.71 (↑0.3%) | 83.86 (↓7.7%) | 108.54 (↓5%) | 47.62 (↓43.5%) |
| Probability of becoming a CM case | |||||
| 0.12 | 95.39 (↑7.7%) | 44.17 (↑1.3%) | 126.05 (↑38.8%) | 102.39 (↓10.4%) | 96.25 (↑14.2%) |
| 0.23 | 82.29 (↓7.1%) | 43.70 (↑0.2%) | 90.80 (↓0%) | 99.66 (↓12.8%) | 84.88 (↑0.7%) |
| Basic mastitis control plan cost | |||||
| Low-cost 6 | 81.64 (↓7.9%) | 36.35 (↓16.6%) | 77.92 (↓14.2%) | 103.57 (↓9.3%) | 70.36 (↓16.5%) |
| High-cost 7 | 95.74 (↑8.1%) | 50.96 (↑16.9%) | 104.02 (↑14.5%) | 125.42 (↑9.8%) | 98.64 (↑17%) |
| Milk price (USD/kg) | |||||
| 0.263 | 86.46 (↓2.4%) | 43.60 (↓0%) |
93.65 (↑3.1%) | 103.64 (↓9.3%) | 78.95 (↓6.3%) |
| 0.357 | 97.02 (↑9.5%) | 43.80 (↑0.5%) | 108.06 (↑19%) | 126.99 (↑11.2%) | 86.56 (↑2.7%) |
| Basic mastitis control plan efficacy | |||||
| 0.495 | 145.45 (↑64.2%) | 48.63 (↑11.5%) | 307.75 (↑238.9%) | 203.94 (↑78.5%) | 180.39 (↑114%) |
| 0.605 | 50.77 (↓42.7%) | 43.57 (↓0.1%) | 55.19 (↓39.2%) | 57.26 (↓49.9%) | 47.07 (↓44.2%) |
1 SM: Subclinical mastitis; 2 CM: Clinical mastitis; 3 BASIC: Basic mastitis of prevention and control plan including post-milking teat disinfection for all lactating cows, fore-stripping, and washing and drying teats and milking machine test; 4 SEG: the strategies from scenario BASIC were combined with segregating of CIC kept separated and milking last; 5 CULL: the strategies from scenario BASIC were combined with the culling of CIC (CULL1: cows that had 2 CM in current lactation; CULL2: cows that had 3 CM in the current lactation; and CULL3: cows that had 6 SCC peaks over 200,000 cells/mL in current lactation). 6 Each practice of the mastitis control plan was reduced by 17%. 7 Each practice of the mastitis control plan was increased by 17%.