title: Risk factors for Salmonella enterica subsp. enterica shedding by market-age pigs in French farrow-to-finish herds.
abstract: Fattening-pigs carriers of Salmonella enterica are believed to be a main source of carcass and pork contamination at the later steps of the meat process. We did a prospective study in 2000-2001 in 105 French farrow-to-finish pig farms. In each farm, a batch of contemporary fattening pigs housed in the same room was followed throughout the fattening period. Salmonella shedding was assessed on environmental samples of faecal material (taken by means of pairs of gauze socks) analysed by classical bacteriological methods. 36.2% of the batches studied had at least one contaminated environmental sample and therefore were classified as Salmonella-shedding batches. Logistic regression was used to assess the association between managerial and hygiene practices and health status and the shedding risk at the end of the finishing period. Emptying the pit below the slatted floor after the previous batch of sows was removed and frequent removal of sow dung during the lactation period were protective. Presence of residual Salmonella contamination of the floor and pen partitions in the fattening rooms before loading the growing pigs also was a risk factor. The risk for Salmonella shedding at the end of the fattening period was increased when dry feed (versus wet feed) was provided during the fattening period. Lastly, Lawsonia intracellularis seroconversion and PRRSV seropositivity during the fattening period also was a risk factor for Salmonella shedding.
authors.affiliation: AFSSA, French Agency for Food Safety, Pig and Poultry Veterinary Research Laboratory, Epidemiology and Quality Assurance in Pig Production Research Unit, Zoopôle, BP 53, 22440 Ploufragan, France. pierre-alexandre.beloeil@agriculture.gouv.fr
authors.forename: P-A
authors.initials: PA
authors.lastname: Beloeil
authors.forename: P
authors.initials: P
authors.lastname: Fravalo
authors.forename: C
authors.initials: C
authors.lastname: Fablet
authors.forename: J-P
authors.initials: JP
authors.lastname: Jolly
authors.forename: E
authors.initials: E
authors.lastname: Eveno
authors.forename: Y
authors.initials: Y
authors.lastname: Hascoet
authors.forename: C
authors.initials: C
authors.lastname: Chauvin
authors.forename: G
authors.initials: G
authors.lastname: Salvat
authors.forename: F
authors.initials: F
authors.lastname: Madec
mesh_terms: D000821:Animal Feed / Q000592:standards; D000822:Animal Husbandry / Q000379:methods / Q000592:standards; D000818:Animals; D002353:Carrier State / Q000453:epidemiology / Q000382:microbiology / Q000662:veterinary*; D003430:Cross-Sectional Studies; D005243:Feces / Q000382:microbiology; D005500:Follow-Up Studies; D005506:Food Contamination / Q000517:prevention & control; D005516:Food Microbiology; D005602:France / Q000453:epidemiology; D006920:Hygiene; D016015:Logistic Models; D008460:Meat / Q000382:microbiology*; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D011446:Prospective Studies; D012307:Risk Factors; D012481:Salmonella Infections, Animal / Q000453:epidemiology / Q000209:etiology* / Q000382:microbiology; D019779:Salmonella enterica / Q000302:isolation & purification*; D011795:Surveys and Questionnaires; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology / Q000209:etiology* / Q000382:microbiology