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Table 4 Mean ± standard deviation (SD) and the associated 90% confidence interval (CI, 5 to 95%), minimum and maximum annual gross margin and net profit in farmsa with different prevalence of pleurisy and lung scars on slaughter pigs. Results were obtained during the risk analysis by performing stochastic simulation analysis by Monte Carlo sampling with 10,000 iterations (‘farms’) using the Microsoft Excel add-in @Risk [44]

From: A bio-economic simulation study on the association between key performance indicators and pluck lesions in Irish farrow-to-finish pig farms

Variable € per year € per pig € per kg
LPLSCb LPHSCc HPd LPLSC LPHSC LP LPLSC LPHSC HP
Gross margin, €
 Mean 978,020 883,579 846,131 51.1 47.2 45.2 0.61 0.57 0.54
 SD 73,587 89,923 52,997 1.8 2.1 1.7 0.02 0.02 0.02
 5% CI 861,044 740,681 761,039 48.1 43.8 42.4 0.58 0.53 0.51
 95% CI 1,101,716 1,035,199 935,183 54.1 50.4 48.1 0.65 0.61 0.57
 Minimum 730,977 571,026 657,281 43.7 38.0 38.2 0.53 0.46 0.46
 Maximum 1,267,410 1,191,485 1,069,961 58.5 55.3 52.0 0.70 0.67 0.62
Net profit, €
 Mean 312,902 218,461 181,014 16.2 11.4 9.6 0.20 0.14 0.11
 SD 73,587 89,923 52,997 3.1 4.1 2.6 0.04 0.05 0.03
 90% CI 195,926-436,598 75,563-370,082 95,921-270,066 10.1–21.2 4.5–17.9 5.4–13.8 0.13–0.26 0.05–0.21 0.06–0.16
 Minimum 65,860 −94,091 − 7836 4.0 −6.3 −0.5 0.05 −0.08 −0.01
 Maximum 602,293 526,367 404,843 27.1 24.4 19.6 0.33 0.29 0.23
  1. a728 sow farrow-to-finish farms with weekly farrowing batches were simulated to represent three different scenarios. A total of 10,000 iterations (i.e. farms) were simulated for each scenario. At each iteration, all stochastic input variables (i.e. biological inputs, feedstuff and pork prices) varied simultaneously by randomly sampling a new set of values for each variable from their corresponding distributions. Additionally, gross margins and net profit were calculated for each iteration
  2. bScenario 1: a farrow-to-finish farm with prevalence of pleurisy < 25% and prevalence of lung scars < 8% with a wean-to-finish average daily gain (ADG) of 760 g and reaching target slaughter weight at 24 weeks of age
  3. cScenario 2: a farrow-to-finish farm with prevalence of pleurisy < 25% and prevalence of lung scars ≥8% (LPHSC) with an ADG of 725 g and reaching target slaughter weight at 25 weeks of age
  4. dScenario 3: a farrow-to-finish farm with prevalence of pleurisy ≥25% (HP) with and ADG of 671 g and reaching target slaughter weight at 26 weeks of age
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