Mannanoligosaccharide: Abwehr pathogener Keime im Kuekendarm.
1997
Spring P. | Wenk C. | Dawson K. | Newman K.
The ability of different enteric pathogens and coliforms to trigger agglutination of a yeast cell wall preparation (MOS) and a yeast culture (Saccharomyces cerevisiae, NYCC 1026) was studied. Three strains which agglutinated MOS (Salmonella typhimurium 29E, Salmonella dublin, and Escherichia coli 15R) and one non-agglutinating strain (S. typhimurium 27A) were then selected as challenge organisms. The effects of dietary MOS on cecal concentrations of these organisms and on activities and concentrations of the cecal microflora were evaluated in chicks under controlled conditions. Five out of seven strains of E. coli and seven out of ten strains of S. typhimurium and Salmonella enteritidis agglutinated MOS and S. cerevisiae. Strains of Salmonella choleraesuis, Salmonella pullorum, and Campylobacter did not lead to agglutination. In a series of three trials in which 3-day-old chicks were orally challenged with 10E4 CFU of S. typhimurium 29E, birds receiving 4000 ppm of dietary MOS had reduced cecal S. typhimurium 29E concentrations (5.40 vs. 4.01 log CFU/g; p < 0.05) at day 10. In a second series of three trials with S. dublin as challenge organism the number of birds that tested salmonella positive in the ceca at day 10 was lower when MOS was part of the diet (90 % vs. 56 %; p < 0.05). Mannanoligosaccharide also reduced the number of birds from which the challenge organism E. coli 15R could be recovered (75 % vs. 15 %). In order to test the effect of MOS on concentrations of bacteria that do no express type-1 fimbriae, a challenge trial was conducted with S. typhimurium 27A. However, strain 27A did not colonise the birds sufficiently to evaluate if MOS affected its cecal concentrations. Manninoligosaccharide showed a tendency to reduce the concentrations of cecal coliforms, however, it had no effect on cecal concentrations of lactobacilli, enterococci, anaerobic bacteria, lactate, VFA, or cecal pH.
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