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This study shows poultry probiotics like Pediococcus sp. can ferment fructooligosaccharides (FOS), unlike Salmonella. This suggests potential for FOS as a prebiotic to support beneficial gut bacteria in poultry.

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Area of Science:

  • Animal Science
  • Microbiology
  • Food Science

Background:

  • Direct-fed microbials (DFMs) are used in poultry for gut health.
  • Fructooligosaccharides (FOS) are prebiotics that can modulate gut microbiota.
  • Understanding bacterial metabolism of FOS is crucial for DFM efficacy.

Purpose of the Study:

  • To characterize the metabolic capabilities of potential poultry DFMs and Salmonella spp. regarding fructooligosaccharide (FOS) utilization.
  • To compare the oxidative and fermentative utilization of FOS substrates by selected bacteria.

Main Methods:

  • Oxygen uptake (QO2) using a Warburg respirometer to assess oxidative metabolism.
  • pH change measurements to evaluate fermentation of glucose and FOS.
  • Spectrophotometric analysis of cell-free extracts for enzyme activity.

Main Results:

  • Salmonella spp. showed similar oxygen uptake with glucose and FOS-50®, but lower uptake with pure FOS.
  • DFM bacteria (Enterococcus faecium, Lactococcus lactis, Pediococcus sp.) had low oxygen uptake, indicating limited oxidative utilization of FOS.
  • All tested DFMs fermented glucose and FOS, with Pediococcus sp. exhibiting the fastest fermentation rate.
  • Enzyme analysis suggested Pediococcus sp. could hydrolyze FOS, but the presence of free glucose in the FOS solution complicated interpretation.

Conclusions:

  • Poultry-associated DFM bacteria can ferment FOS, suggesting its potential as a prebiotic in poultry diets.
  • Salmonella spp. have a limited ability to utilize FOS oxidatively compared to glucose.
  • Further research is needed to confirm FOS hydrolysis by DFM enzymes and its in vivo effects.