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Selected Publication:

Publication type: Journal Article
Document type: Review

Year: 2007

Author(s): Rehman, HU; Vahjen, W; Awad, WA; Zentek, J

Title: Indigenous bacteria and bacterial metabolic products in the gastrointestinal tract of broiler chickens.

Source: Arch Anim Nutr. 2007; 61(5):319-335



Authors Vetmeduni Vienna:

Awad Wageha
Zentek J├╝rgen

Vetmed Research Units
Institute of Animal Nutrition and Functional Plant Compounds


Abstract:
The gastrointestinal tract is a dynamic ecosystem containing a complex microbial community. In this paper, the indigenous intestinal bacteria and the microbial fermentation profile particularly short chain fatty acids (SCFA), lactate, and ammonia concentrations are reviewed. The intestinal bacterial composition changes with age. The bacterial density of the small intestine increases with age and comprises of lactobacilli, streptococci, enterobacteria, fusobacteria and eubacteria. Strict anaerobes (anaerobic gram-positive cocci, Eubacterium spp., Clostridium spp., Lactobacillus spp., Fusobacterium spp. and Bacteroides) are predominating caecal bacteria in young broilers. Data from culture-based studies showed that bifidobacteria could not be isolated from young birds, but were recovered from four-week-old broilers. Caecal lactobacilli accounted for 1.5-24% of the caecal bacteria. Gene sequencing of caecal DNA extracts showed that the majority of bacteria belonged to Clostridiaceae. Intestinal bacterial community is influenced by the dietary ingredients, nutrient levels and physical structure of feed. SCFA and other metabolic products are affected by diet formulation and age. Additional studies are required to know the bacterial metabolic activities together with the community analysis of the intestinal bacteria. Feed composition and processing have great potential to influence the activities of intestinal bacteria towards a desired direction in order to support animal health, well-being and microbial safety of broiler meat.

Keywords Pubmed: Age Factors
Animal Feed*
Animal Nutritional Physiological Phenomena/physiology*
Animals
Bacteria/growth & development*
Bacteria/metabolism
Chickens/metabolism
Chickens/microbiology*
Consumer Product Safety
Fatty Acids, Volatile/biosynthesis
Fermentation
Gastrointestinal Tract/microbiology*
Humans


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