Effects of a mannan-rich yeast cell wall-derived preparation on cecal concentrations and tissue prevalence of Salmonella Enteritidis in layer chickens.

Autor: Girgis G; Nevysta Laboratory, Iowa State University Research Park, Ames, IA, United States of America., Powell M; Nevysta Laboratory, Iowa State University Research Park, Ames, IA, United States of America., Youssef M; Nevysta Laboratory, Iowa State University Research Park, Ames, IA, United States of America., Graugnard DE; Alltech Center for Animal Nutrigenomics and Applied Animal Nutrition, Nicholasville, KY, United States of America., King WD; Alltech Center for Animal Nutrigenomics and Applied Animal Nutrition, Nicholasville, KY, United States of America., Dawson KA; Alltech Center for Animal Nutrigenomics and Applied Animal Nutrition, Nicholasville, KY, United States of America.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2020 Apr 23; Vol. 15 (4), pp. e0232088. Date of Electronic Publication: 2020 Apr 23 (Print Publication: 2020).
DOI: 10.1371/journal.pone.0232088
Abstrakt: Salmonella Enteritidis (SE) has been the most common Salmonella serotype associated with foodborne infections in the last several years. Dietary applications of yeast-based preparations in feed have shown to reduce Salmonella colonization in chickens augmenting SE control strategies. This study was conducted to evaluate the effects of a mannan-rich yeast cell wall-derived preparation (Actigen®) administered in feed at a rate of 400 g/ton on SE colonization in the cecum and internal organs of commercial layer chickens. Sixteen week-old layer pullets were orally challenged with a selected nalidixic acid resistant SE strain at a dose of 1.7×10^9 colony forming units (CFU) per bird. SE colonization was assessed by evaluating isolation rates from ovary and pooled liver/spleen samples as well as enumeration of SE in cecal pouches one week post-challenge. Recovery rates of SE from the ovaries of directly challenged birds receiving Actigen® were significantly lower (P <0.02) than those in directly challenged birds fed an unsupplemented control diet. Recovery rates of SE from pooled liver/spleen samples were not significantly different between Actigen®-treated pullets and controls (P = 0.22). Using direct plate count methods, cecal SE concentrations were 1 log10 lower (P <0.001) in challenged pullets in the Actigen®-supplemented group than in the challenged controls. The SE concentration distributions in the ceca were similar in groups testing positive and groups testing negative for SE in the ovaries and liver/spleens tissues. As a result, SE concentrations in the ceca could not be directly related to the occurrence or prevalence of SE in these tissues. In conclusion, Actigen® supplementation appears to decrease the prevalence of SE in ovarian tissue and concentrations of SE in cecal contents and may be useful as a tool for reducing the risk of eggshell contamination and transovarian transmission of SE in eggs.
Competing Interests: We have read the journal's policy and the authors of this manuscript have the following competing interests: The authors and participants in this project are all employed by either the Alltech Center for Nutrigenomics and Applied Animal Nutrition or Nevysta Laboratory. We confirm that this does not alter our adherence to PLOS ONE policies on sharing data and materials.
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje