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The aim of this review is to evaluate and summarize the evidence for associations between feeding management practices and feed characteristics, and Salmonella prevalence in swine, wh1ch may represent opportunities for Interventions. Salmonella prevalence 1n the rev1ewed literature was measured either by culture or by the presence of ant1bod1es. A systematic rev1ew of the area was conducted, the goal being to minimize the impact of b1as. SystematiC rev1ews Include an assessment of the quality of studies and exclusion of studies that fa1l to meet standards for published material. The review evaluated evidence for an association between feed withdrawal from swine prior to slaughter, acidification of feed , heat treatment of feed, pellet vs. mash, course vs fine grind, and wet vs. dry A large number of intervention studies were excluded from the review because they failed to report des1gn features designed to lim1t the Introduction of b1as such as randomization and blinding. The maJority of studies included were cross sect1onal stud1es, however these failed to provide strong evidence of an association because of the potential for confounding and the fai lure to document a temporal association between exposure to the nsk factor and the outcome. The rev1ew concluded that tl"le strongest body of work was available for pelleted feed and dry feed , however there was still uncertamty about the situations were th1s association may be effective The conclusion was that there should be a low level of comfort among qualified scientists that the claimed association/relationship is scientifically valid . Th1s rankmg is primarily based on moderate to low quality stud1es, or insufficient numbers of tested 1nd1v1duals or herds, resultmg in a low degree of confidence that results could be extrapolated to the target population. 304 S fopork 2007Verona (Italy) Scss1on 4: Control str, t g1t

international conference on the epidemiology and control of biological, chemical and physical hazards in pigs and pork

Interventions associated with feeding management practices and feed characteristics, and measures of Salmonella prevalence in live and slaughtered swine: A systematic review and summation of evidence