Effects of Nondigestible Oligosaccharides onSalmonella entericaSerovar Typhimurium and NonpathogenicEscherichia coliin the Pig Small Intestine In Vitro

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Abstract
An in vitro intestinal tissue model was developed for the investigation of bacterial association in the pig small intestine under different dietary regimes. In preliminary experiments, jejunal and ileal tissue was taken from Danish Landrace pigs fed standard diet and inoculated with eitherSalmonellaor nonpathogenicEscherichia colistrains. Higher numbers of salmonellae associated with the ileal tissues, but the numbers did not reach significance. Hence, jejunal sections were inoculated with nonpathogenicE. coliand ileal sections were inoculated with salmonellae in the presence of mannose or commercial nondigestible oligosaccharides (NDO) at 2.5%. There was a significant decrease inE. coliassociated with the jejunum in the presence of mannose (P< 0.05). Furthermore, in pigs fed a diet supplemented with commercial NDO at 4% there was a significant reduction in the numbers ofE. coliin jejunal organ cultures of pigs fed the FOS diet (P< 0.05). There was a reduction, though not a significant one, in the association ofSalmonellasp. to the ileal sections of pigs fed the commercial FOS diet. The feeding of commercial GOS or its addition to organ cultures did not affectE. coliorSalmonellanumbers.