Document Detail


Change in the ileal bacterial population of turkeys fed different diets and after infection with Salmonella as determined with denaturing gradient gel electrophoresis of amplified 16s ribosomal DNA.
MedLine Citation:
PMID:  18577625     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Changes in ileal bacterial populations of Salmonella-infected turkeys fed different diets were analyzed by using 16S-V3 PCR denaturing gradient gel electrophoresis. Turkeys raised on litter flooring were fed wheat- and corn-based diets with and without enzyme preparations (XY1 and XY2, respectively) from 0 to 126 d. Preparation XY1 contained exclusively endoxylanase, whereas preparation XY2 contained endoxylanase, protease, and alpha-amylase (Danisco, , Wiltshire, UK). The dietary activity levels of XY1 and XY2 were 2,500 and 650 endo-1,4-beta-xylanase units/kg of feed, respectively. Microbial DNA was extracted from the ileal content of 16-wk-old turkeys, and the 16S rDNA gene was amplified by PCR and analyzed by denaturing gradient gel electrophoresis. Diversity indexes, including richness (number of species, S), evenness (relative distribution of species, EH), diversity (using Shannon's index, H'), and Sorenson's pairwise similarities coefficient (measures the species in common between different habitats, Cs) were calculated. Additionally, diversity indexes were associated with Salmonella prevalence determined from fresh fecal droppings collected from each pen. On the basis of contrast analysis, the wheat-based diets resulted in higher microbial diversity indexes than the corn-based diets (S = 10 vs. 12; EH = 0.9 vs. 0.8; H' = 2.2 vs. 1.9, P < 0.05). Likewise, enzyme supplementation stimulated growth of the microbiota and increased the diversity indexes in comparison with unsupplemented treatments (S = 13 vs. 10; EH = 0.9 vs. 0.8; H' = 2.2 vs. 1.9, P < 0.05). Salmonella prevalence was higher (P < 0.05) at 15 wk in turkeys fed the corn-based diet (Salmonella prevalence = 50%) than in turkeys fed the corn-enzyme (Salmonella prevalence = 13%) and wheat-based (Salmonella prevalence = 0%) dietary treatments. Therefore, contrast analysis showed that birds fed the corn control diet had lower microbiota diversity but higher Salmonella prevalence than birds fed the enzyme-supplemented and wheat-based diets. In contrast, birds fed the wheat-based diets had higher diversity but lower Salmonella prevalence than birds fed the corn-based diets. High dietary nonstarch polysaccharides from wheat and dietary exogenous enzyme supplementation promoted microbial community diversity and apparently discouraged Salmonella colonization through competitive exclusion. Nonstarch polysaccharides and dietary exogenous enzyme supplementation may be practical tools to control enteric pathogens and benefit the intestinal health and food safety of the birds.
Authors:
A A Santos; P R Ferket; F B O Santos; N Nakamura; C Collier
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Poultry science     Volume:  87     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-06-25     Completed Date:  2008-10-28     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1415-27     Citation Subset:  IM    
Affiliation:
Department of Health and Biomedical Sciences, Florida Hospital College of Health Sciences, Orlando, FL 32803, USA. anael.santos@fhchs.edu
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MeSH Terms
Descriptor/Qualifier:
Animal Feed / analysis
Animal Nutritional Physiological Phenomena
Animals
Diet / veterinary*
Dietary Supplements
Electrophoresis, Gel, Two-Dimensional
Gastrointestinal Contents / microbiology
Ileum / microbiology*
Nucleic Acid Denaturation
Polymerase Chain Reaction / veterinary
RNA, Ribosomal, 16S / genetics*
Salmonella Infections / microbiology*
Triticum
Turkeys / microbiology*
Zea mays
Chemical
Reg. No./Substance:
0/RNA, Ribosomal, 16S

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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