Salmonella occurrence and Enterobacteriaceae counts in pig feed ingredients and compound feed from feed mills in Ireland

Burns, A.M., Lawlor, P.G., Gardiner, G.E., McCabe, E.M., Walsh, D., Mohammed, M., Grant, J. and Duffy, G. 2015. Salmonella occurrence and Enterobacteriaceae counts in pig feed ingredients and compound feed from feed mills in Ireland. Preventive Veterinary Medicine. 121 (3-4), pp. 231-239. doi:10.1016/j.prevetmed.2015.07.002

TitleSalmonella occurrence and Enterobacteriaceae counts in pig feed ingredients and compound feed from feed mills in Ireland
TypeJournal article
AuthorsBurns, A.M., Lawlor, P.G., Gardiner, G.E., McCabe, E.M., Walsh, D., Mohammed, M., Grant, J. and Duffy, G.
Abstract

The purpose of this study was to assess the occurrence of non-typhoidal Salmonellae and Enterobacteriaceae counts in raw ingredients and compound feeds sampled from feed mills manufacturing pig diets. Between November 2012 and September 2013, feed ingredients (n = 340) and compound pig feed (n = 313) samples were collected from five commercial feed mills and one home compounder at various locations throughout Ireland. Feed ingredients included cereals, vegetable protein sources and by-products of oil extraction and ethanol production. The compound feeds included meal and pelleted feed for all stages of pig production. Samples were analysed for Salmonella using standard enrichment procedures. Recovered isolates were serotyped, characterised for antibiotic resistance and subtyped by multi locus variance analysis (MLVA). Total Enterobacteriaceae counts were also performed. Salmonella was recovered from 2/338 (0.6%) ingredients (wheat and soybean meal), at two of the six mills. Salmonella was also detected in 3/317 (0.95%) compound feeds including pelleted feed which undergoes heat treatment. All isolates recovered from feed ingredient and compound feed samples were verified as Salmonella enterica subsp. enterica serotype (4,[5],12:i:-) that lack the expression of flagellar Phase 2 antigens representing monophasic variants of Salmonella Typhimurium (4,[5],12:i:-). Isolates exhibited resistance to between two and seven antimicrobials. Two distinct MLVA profiles were observed, with the same profile recovered from both feed and ingredients, although these did not originate at the same mill. There was no relationship between the occurrence of Salmonella and a high Enterobacteriaceae counts but it was shown that Enterobacteriaceae counts were significantly lower in pelleted feed (heat treated) than in meal (no heat treatment) and that Enterobacteriaceae counts would be very useful indicator in HACPP programme. Overall, although the prevalence of Salmonella in pig feed and feed ingredients in the present study was low, even minor Salmonella contamination in feed has the potential to affect many herds and may subsequently cause human infection. Furthermore, the recovery of a recently emerged serovar with multi-antibiotic resistance is a potential cause for concern.

JournalPreventive Veterinary Medicine
Journal citation121 (3-4), pp. 231-239
ISSN0167-5877
Year2015
PublisherElsevier
Digital Object Identifier (DOI)doi:10.1016/j.prevetmed.2015.07.002
PubMed ID26211839
Publication dates
Published in print01 Oct 2015
Published online08 Jul 2015

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