Different feed withdrawal times before slaughter influence caecal fermentation and faecal Salmonella shedding in pigs

Sandra Martín-Peláez, Bibiana Peralta, Eva Creus, Antonio Dalmau, Antonio Velarde, Jose F. Pérez, Enric Mateu, Susana M. Martín-Orúe

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

The effects of different pre-slaughter feed withdrawal times (FWT) on the gastrointestinal tract (GIT) weight and the gut environment of pigs and Salmonella shedding were investigated. Trial 1 evaluated the effects under experimental conditions (feed withdrawal for 18, 30 and 36 h) and trial 2 under commercial conditions (15 and 30 h). In trial 1, the GIT weight tended to decrease (P = 0.07), the caecal pH increased (P < 0.0001), short-chain fatty acids (SCFA) decreased (P < 0.001) and percentage of branched-chain fatty acids (BCFA) increased as FWT increased. Similar results were observed in trial 2, but Enterobacteriaceae numbers and Salmonella positive pigs tended to increase whereas lactobacilli decreased (P < 0.0005) as FWT increased. The increase in FWT involved changes in the gut microbial ecosystem that could be associated with the trend of increased caecal Enterobacteriaceae and Salmonella in faeces, and may represent a higher risk of carcass contamination in cases of laceration of viscera. © 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)469-473
JournalVeterinary Journal
Volume182
DOIs
Publication statusPublished - 1 Dec 2009

Keywords

  • Caecal fermentation
  • Enterobacteriaceae
  • Feed withdrawal
  • Pigs
  • Salmonella

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