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Ruminal evacuation's effect on microbial activity and ruminal function.

G Towne, T G Nagaraja, C Owensby

    Journal of Animal Science
    |March 1, 1986
    PubMed
    Summary
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    Evacuating and returning ruminal contents did not significantly alter microbial populations or volatile fatty acid (VFA) concentrations in steers. This procedure appears safe for ruminal microorganisms and digestive functions.

    Area of Science:

    • Animal Science
    • Ruminant Nutrition
    • Microbiology

    Background:

    • Ruminal evacuation is a technique used for sampling and research.
    • Potential impacts on ruminal function and microbial ecology are not fully understood.

    Purpose of the Study:

    • To investigate the effects of ruminal content evacuation, mixing, and reintroduction on microbial populations, volatile fatty acid (VFA) concentrations, and liquid flow rate in steers.
    • To assess the potential disruption to ruminal anaerobiosis and microbial health.

    Main Methods:

    • Four ruminal-cannulated Hereford steers were subjected to complete ruminal content evacuation, mixing, and reintroduction.
    • Samples were collected immediately, 1 hour, and 4 hours post-procedure.
    • Control steers (non-evacuated) were sampled at identical intervals.

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    Main Results:

    • No significant differences were observed between evacuated and non-evacuated steers in total anaerobic, cellulolytic, and facultative bacteria, protozoa, oxidation-reduction potential, VFA concentrations, and liquid flow rates, when averaged over time.
    • No treatment by time interactions were detected.
    • No differences in microbial populations or VFA concentrations were observed over time, except for holotrich protozoa and VFA.

    Conclusions:

    • Ruminal evacuation, mixing, and reintroduction of digesta does not appear to be disruptive to ruminal anaerobiosis.
    • The procedure is not detrimental to ruminal microorganisms or digestive processes in cattle.
    • This method is a viable technique for ruminal sampling in research settings.