Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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The Use of Multilevel Model to Evaluate the Risk Factors for Porcine Reproductive and Respiratory Syndrome in Swine Herds

다층모형을 이용한 국내 양돈농가의 돼지생식기호흡기증후군 위험요인 분석

  • Kim, Eu-Tteum (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University) ;
  • Lee, Kyoung-Ki (Animal Disease Diagnostic, Animal and Plant Quarantine Agency) ;
  • Kim, Seong-Hee (Animal Disease Diagnostic, Animal and Plant Quarantine Agency) ;
  • Pak, Son-Il (College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University)
  • 김으뜸 (강원대학교 수의과대학.동물의학종합연구소) ;
  • 이경기 (농림축산검역본부 질병진단과) ;
  • 김성희 (농림축산검역본부 질병진단과) ;
  • 박선일 (강원대학교 수의과대학.동물의학종합연구소)
  • Received : 2016.11.23
  • Accepted : 2017.03.28
  • Published : 2017.04.28
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Abstract

The goal of this study was to investigate risk factors associated with porcine reproductive and respiratory syndrome (PRRS) in pig farms in the Republic of Korea using logistic regression and a multilevel model. A cross-sectional study was applied to 305 pig farms with a questionnaire-based interview by veterinarians between March 2014 and February 2015. The questionnaire comprised eight categories: proximity to neighbors, disinfection, visitors, vehicles, insecticides, wild animals, gilts, and feeding. In total, 61 questions in eight categories related to pig farm biosecurity were investigated. Farms were classified as PRRS stable or unstable based on the results of an antibody test and PCR. For univariate analysis, keeping production records with computers (OR = 0.283, 95% CI = 0.056 - 1.425), accredited farm with no use of antibiotics (OR = 0.412, 95% CI = 0.134 - 1.269), reviewing health record of semen prior to purchasing (OR = 0.492, 95% CI = 0.152 - 1.589), complete isolation of runt pigs (OR = 0.264, 95% CI = 0.084 - 0.829), compulsory registering for visitors (OR = 0.424, 95% CI = 0.111 - 1.612), keeping records of insecticide history (OR = 0.406, 95% CI = 0.089 - 1.846), routine on-farm monitoring by veterinarians (OR = 0.314, 95% CI = 0.069 - 1.423), and use of on-farm checklist for biosecurity monitoring (OR = 0.313, 95% CI = 0.063 - 1.553) were found to decrease the probability of PRRS infection. Multivariate and multilevel analysis revealed only two factors, complete isolation of runt pigs (OR = 0.165, 95% CI = 0.045 - 0.602 and OR = 0.208, 95% CI = 0.055 - 0.782) and compulsory registering for visitors (OR = 0.106, 95% CI = 0.017 - 0.655 and OR = 0.119, 95% CI = 0.017 - 0.809) were found to decrease the probability of PRRS infection. The intracluster correlation coefficient of a province for multilevel model was 0.05. The results of this study might facilitate biosecurity measures for individual farms to reduce the probability of PRRS infection.

Keywords

References

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