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Cellulolytic bacteria from pig large intestine.

V H Varel, S J Fryda, I M Robinson

    Applied and Environmental Microbiology
    |January 1, 1984
    PubMed
    Summary

    Researchers isolated cellulose-degrading bacteria Bacteroides succinogenes and Ruminococcus flavefaciens from pig feces. Their abundance varied with dietary fiber content, impacting the gut microbiome composition.

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    Area of Science:

    • Microbiology
    • Animal Science
    • Gastroenterology

    Background:

    • Gut microbiota plays a crucial role in animal digestion and health.
    • Cellulose-degrading bacteria are key components of herbivore and omnivore digestive systems.
    • Dietary fiber significantly influences the composition and function of the gut microbiome.

    Purpose of the Study:

    • To isolate and identify anaerobic, cellulose-degrading bacteria from pig fecal samples.
    • To investigate the relationship between dietary fiber intake and the prevalence of specific cellulolytic bacteria in pigs.
    • To understand the contribution of Bacteroides succinogenes and Ruminococcus flavefaciens to the pig gut microbiome.

    Main Methods:

    • Isolation of anaerobic bacteria from pig fecal samples using selective culture techniques.
    • Identification of bacterial isolates using Gram staining and biochemical characterization.
    • Quantification of cellulolytic bacteria populations using most-probable-number (MPN) methods.
    • Analysis of bacterial populations in pigs fed varying dietary fiber levels.

    Main Results:

    • Bacteroides succinogenes (Gram-negative rod) and Ruminococcus flavefaciens (Gram-positive coccus) were successfully isolated.
    • These cellulose-degrading bacteria constituted 4% of the viable bacterial count in pigs fed a low-fiber diet.
    • In pigs fed a high-fiber diet, these bacteria represented 6% of the viable bacterial count.
    • Dietary fiber content directly correlated with the relative abundance of these key cellulolytic species.

    Conclusions:

    • Bacteroides succinogenes and Ruminococcus flavefaciens are significant members of the pig gut microbiota involved in cellulose degradation.
    • Dietary fiber manipulation can alter the population dynamics of these essential cellulolytic bacteria in swine.
    • Understanding these bacterial populations provides insights into swine nutrition and digestive physiology.

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