Effects of Nondigestible Oligosaccharides onSalmonella enterica Serovar Typhimurium and NonpathogenicEscherichia coli in the Pig Small Intestine In Vitro

摘要

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 either Salmonella or nonpathogenicEscherichia coli strains. Higher numbers of salmonellae associated with the ileal tissues, but the numbers did not reach significance. Hence, jejunal sections were inoculated with nonpathogenic E. coli and 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. coli associated with the jejunum in the presence of mannose (P E. coli in jejunal organ cultures of pigs fed the FOS diet (P Salmonella sp. to the ileal sections of pigs fed the commercial FOS diet. The feeding of commercial GOS or its addition to organ cultures did not affect E. coli orSalmonella numbers.