Table 4. Input parameters and probabilities used in the quantitative models for the assessment of the exposure of US swine populations to imported swine products (PEP).
| Notation | Definition | Parametrization | Source | Values |
|---|---|---|---|---|
| WR | Proportion food waste in the retail sector | Normal (μ, σ) | [51] [52] | Normal (0.09, 0.02) |
| WC | Proportion of food waste at consumer level (restaurants and households) | Normal (μ, σ) | [53][54] | Normal (0.23, 0.06) |
| CRTE | Proportion of pork consumed in restaurants vs households | Normal (μ, σ) | [55][56] | Normal (0.20, 0.03) |
| SFR & SFRTE | Probability of domestic pigs having access to pork waste originated in retail (R) or restaurants (RTE) by swill feeding | • SFR = WR* SF|WR*(GF*((1- Ef) + Pil)) • SFRTE = WRTE* SF|WRTE*(GF*((1- Ef) + Pil)) |
||
| SF|WR | Proportion of food waste from retail used in swill feeding | Pert (min, most likely, max) | [41] [45] | Pert (0.05, 0.11, 0.15) |
| SF|WRTE | Proportion of food waste from restaurants used in swill feeding | Normal (μ, σ) | [41][45] | Normal (0.02, 0.002) |
| GF | States of the US where garbage feeding is allowed | Boolean variable | [43] | (0, 1) |
| Ef | Efficacy of heat treatment of food waste used to feed animals | Beta (α1, α2) | [57] | Beta (99.7, 6.2) |
| Pil | Probability of illegal swill feeding activities in states where garbage feeder is not allowed | Beta (α1, α2) | Assumption based on [57] | Beta (99.7, 6.2) |
| SFH | Probability of domestic pigs having access to pork waste originated in households (H) by swill feeding | SFH = WC*(1-CRTE)* SF|WH* PHP*(SF|PHP). | ||
| SF|WH | Proportion of food waste from households used in swill feeding | Normal (μ, σ) | [42] | Normal (0.048, 0.005) |
| PHP | Probability of a household in the US having pigs presence | Pert (min, most likely, max) | [47][58] | Pert (0.004, 0.011, 0.013) |
| SF|PHP | Probability of pigs holdings using swill feeding per state (based on size farms) | Normal (μ, σ) | [48] | Example: California (0.23, 0.02) |
| PLF | Probability of feral pigs having contact with food waste in landfills | PLF = (WR*LFR+ RRTE*LFRTE + WH*LFH)* FPA* LFFP |
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| LF|WR | Proportion of food waste from retail sector discarded in landfills | Normal (μ, σ) | [41][45] | Normal (0.57, 0.1) |
| LF|WRTE | Proportion of food waste from restaurants discarded in landfills | Normal (μ, σ) | [45] | Normal (0.84, 0.1) |
| LF|WH | Proportion of food waste from households disposed in landfills | Normal (μ, σ) | [45] | Normal (0.95, 0.1) |
| LFFP | Probability of feral pigs presence in landfills per state | Pert (min, most likely, max) | Spatial analysis (Section 2.1.2) | Example Alabama Pert (0.0005, 0.84, 0.87) |
| FPA | Probability that feral pigs have access to landfills | Pert (min, most likely, max) | Assumption | Pert (0.05,0.1,0.2) |