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A longitudinal study was conducted on five farrow\u2010to\u2010finish commercial pig farms. In each herd, shedding of<jats:italic>Salmonella<\/jats:italic>in faeces was monitored in breeders through service, gestation and lactation. Swabs of the farrowing room floor and pools of faeces from piglets were collected on two occasions during lactation. Environmental pen swabs were also taken in the weaning and finisher houses.<jats:italic>Salmonella<\/jats:italic>isolates were serotyped, tested for antimicrobial resistance (AMR) and typed by Multiple\u2010Locus Variable number tandem repeat Analysis (MLVA). Shedding by breeding pigs was low in all stages of the production cycle; 5% of sows shed at service, the production stage with highest risk of shedding (<jats:italic>p<\/jats:italic>\u00a0&lt;\u00a0.01), 1.6% shed during gestation and 2.5% after farrowing.<jats:italic>Salmonella<\/jats:italic>was detected in 4% of piglet faecal pools in the second week post\u2010farrowing and 5% in the fourth week. Serotyping and AMR profiles of<jats:italic>Salmonella<\/jats:italic>isolates revealed that strains in sows and gilts were mostly different from strains isolated in weaner and finisher facilities. MLVA typing confirmed that the source of infection in piglets was in most instances the contaminated environment rather than their dam. Based on the typing results, it appears that sows do not pose a major risk in the maintenance and transmission of<jats:italic>Salmonella<\/jats:italic>to their progeny but instead the contaminated pen environment is more significant in the perpetuation of the organism on farm.<\/jats:p>","DOI":"10.1111\/zph.12428","type":"journal-article","created":{"date-parts":[[2017,11,28]],"date-time":"2017-11-28T03:54:01Z","timestamp":1511841241000},"source":"Crossref","is-referenced-by-count":20,"title":["<i>Salmonella<\/i>in breeding pigs: Shedding pattern, transmission of infection and the role of environmental contamination in Irish commercial farrow\u2010to\u2010finish herds"],"prefix":"10.1111","volume":"65","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5743-3793","authenticated-orcid":false,"given":"H.","family":"Lynch","sequence":"first","affiliation":[{"name":"Teagasc, Food Research Centre Ashtown Ireland"},{"name":"UCD Veterinary Sciences Centre University College Dublin Dublin Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"K.","family":"Walia","sequence":"additional","affiliation":[{"name":"Teagasc, Food Research Centre Ashtown Ireland"},{"name":"Department of Science Waterford Institute of Technology Waterford Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F. 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