Effect of yeast-supplemented feed on Salmonella and Campylobacter populations in broilers

Abstract

The effect of the yeast, Saccharomyces boulardii, on experimental cecal colonization of broilers with Salmonella typhimurium and Campylobacter jejuni was investigated. Duplicate pens of broiler chicks were given ad libitum access to a standard feed supplemented with no yeast (control), or 1 g (1x), or 100 g (100x) dried S. boulardii/kg feed. All chicks except negative controls were challenged on Day 4 with 3.2 x 10(8) cfu S. typhimurium and 6.5 x 10(8) cfu C. jejuni by oral gavage. After 3 wk, the broilers were euthanatized and ceca were aseptically removed and analyzed for Salmonella and Campylobacter. Frequency of Salmonella colonization was significantly (P < 0.05) reduced due to yeast treatment. Of the positive control birds, 70% were colonized with Salmonella; whereas only 20 and 5% of the 1x and 100x yeast-treated birds were colonized. Mean number of Salmonella per gram of ceca and contents were log 1.64, 0.35, and 0.15, respectively, for the control, 1x, and 100x yeast-treated birds. Campylobacter colonization was not significantly affected by yeast treatment. Similar results were obtained from a second trial conducted in larger isolation floor pens.

Effects of probiotic (live and inactive Saccharomyces cerevisiae) on meat and intestinal microbial properties of Japonica quail

“…In a study by Sadiaa et al (2010) results show that adding live yeast at 0.4 or 0.8% into laying hen diets can enhance the productive performance and nutrients utilization via the inhibitory effect of yeast against pathogenic bacteria also reveals that probiotics could be successfully used as nutritional tools in poultry feeds for promotion of growth, modulation of intestinal microflora and pathogen inhibition, immunomodulation and promoting meat quality of poultry (Saadia and Nagla, 2010). The antagonistic effect of live yeast against intestinal microflora was elucidated by Line et al (1998) that, several harmful pathogenic bacteria have been shown to exhibit a binding specific for the sugar mannose. A live yeast cells contain mannose in their wall.…”

“…This mannose in the cell wall may cause the yeast to act as a decoy for the attachment of pathogens. Results have shown that yeast does not permanently colonize animals, the yeast and any yeast-bound pathogens are passed out in the bird excretion and bacterial colonization is diminished (Line et al, 1998). Kabir et al (2004) reported that probiotic microorganisms, once established in the gut, may produce substances with bactericidal or bacteriostatic properties (bacteriocins) such as lactoferrin, lysozyme, hydrogen peroxide as well as several organic acids.…”

Effects of Origins of Soybean Meal on Growth Performance, Nutrient Digestibility and Fecal Microflora of Growing Pigs

“…and coliforms in the feces during phases I, II and III (Table 6). It has been reported that dietary sources of protein and fermentable carbohydrates affect the host animal by improving its intestinal balance (Fuller, 1989) and creating gut micro-ecological conditions that suppress harmful microorganisms such as Clostridium and coliforms (Line et al, 1998;Pascual et al, 1999;Shim et al, 2010), as well as by favoring beneficial microorganisms like Lactobacillus and Bifidobacterium. In the present experiment, there were no differences in microflora populations among pigs fed diets containing SBM of different origin.…”

Effects of Origins of Soybean Meal on Growth Performance, Nutrient Retention and Excreta Microflora of Broilers

“…and coliforms in the excreta during starter and finisher period. It has reported that dietary sources of fermentable carbohydrates and protein affect the host animal by improving its intestinal balance (Fuller, 1989) and creating gut micro-ecological conditions that suppress harmful microorganisms like Clostridium and Coliforms (Line et al, 1998;Pascual et al, 1999;Shim et al, 2010), and by favoring beneficial microorganisms like Lactobacillus and Bifidobacterium. In the present experiment, there were no differences in microbial population among birds fed diets containing SBM from different origin.…”