The effects of dietary mannaoligosaccharides on cecal parameters and the concentrations of enteric bacteria in the ceca of salmonella-challenged broiler chicks

Abstract

The ability of different enteric pathogens and coliforms to trigger agglutination of yeast cells (Saccharomyces cerevisiae, NCYC 1026) and a yeast cell wall preparation (MOS) was examined. Five of seven strains of Escherichia coli and 7 of 10 strains of Salmonella typhimurium and Salmonella enteritidis agglutinated MOS and Sac. cerevisiae cells. Strains of Salmonella choleraesuis, Salmonella pullorum, and Campylobacter did not lead to agglutination. Two strains that agglutinated MOS (S. typhimurium 29E and Salmonella dublin) and one nonagglutinating strain (S. typhimurium 27A) were selected as challenge organisms for in vivo studies in chicks under controlled conditions. In a series of three trials in which 3-d-old chicks were orally challenged with 10(4) cfu of S. typhimurium 29E, birds receiving 4,000 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 less when MOS was part of the diet (90 vs 56%; P < 0.05). To test the effect of MOS on concentrations of bacteria that do not express Type 1 fimbriae, a challenge trial was conducted with S. typhimurium 27A. However, strain 27A did not colonize the birds sufficiently to evaluate whether MOS affected its cecal concentration. Mannanoligosaccharide did not significantly reduce the concentrations of cecal coliforms (P < 0.10) although they were numerically lower. It had no effect on cecal concentrations of lactobacilli, enterococci, anaerobic bacteria, lactate, volatile fatty acid, or cecal pH.

Dietary Mannan Oligosaccharides Modulate Gut Microbiota, Increase Fecal Bile Acid Excretion, and Decrease Plasma Cholesterol and Atherosclerosis Development

“…have proposed that MOS binds type‐1 fimbriae on pathogenic bacteria, preventing them from adhering to the intestinal mucosa and inducing an inflammatory trigger 17. In the majority of previous studies, anti‐inflammatory effects of MOS were observed after the application of pathogenic or pro‐inflammatory stimuli, such as E. Coli , Salmonella , or LPS 11, 12, 13.…”

Effects of hydrolyzed yeast supplementation in calf starter on immune responses to vaccine challenge in neonatal calves

“…Hydrolyzed yeast (HY) contains cell wall components and extracts of cell constituents, which possess various biological functions. Yeast cell wall products such as mannoproteins and b-glucans may improve performance and overall health by preventing pathogenic bacteria from binding to intestinal epithelial cells or by modulating immune function (Spring et al, 2000;Davis et al, 2004;Wang et al, 2008). In addition, HY contains a high amount of soluble, bioactive particles that modulate the immune system (Jensen et al, 2008).…”

Performance and macrophage activity of broilers fed with a sorghum meal with different yeast wall levels

“…Waldroup et al (2003) reported that the manna oligosaccharides derived from Saccharomyces cerevisiae were promising in the suppression of gut pathogens, modulation of the immune system, promotion of the intestine integrity and improvement of the performance (feed conversion and weight gain) of turkeys and broilers. Spring et al (2000) also observed reduction of Salmonella sp in the digestive tract of birds treated with 4g of oligosaccharides/kg. This effect is possibly related with the adsorption of the bacteria.…”