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Tissue sterility in uneviscerated carcasses.

C O Gill, N Penney, P M Nottingham

    Applied and Environmental Microbiology
    |August 1, 1978
    PubMed
    Summary
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    Post-mortem bacterial invasion of sheep muscle is unlikely. Bacteria remain in the gut lumen and require tissue breakdown or stomach rupture for invasion, even in stressed animals.

    Area of Science:

    • Food Microbiology
    • Post-mortem Spoilage
    • Meat Science

    Background:

    • Understanding bacterial translocation from the gut to muscle tissue post-mortem is crucial for meat safety and shelf-life.
    • Previous reports suggest certain bacteria, like Clostridia, contribute to deep meat spoilage.

    Purpose of the Study:

    • To investigate the potential for bacterial invasion into sheep muscle tissue after slaughter.
    • To determine the conditions under which bacteria can translocate from the intestinal lumen into carcass tissues.

    Main Methods:

    • Aseptic sampling of sheep muscle from control, unstressed, and stressed carcasses.
    • Bacterial examination of muscle tissue.
    • Whole-body autoradiography using 14C-labeled bacteria in mouse carcasses to track bacterial movement.

    Related Experiment Videos

  • Incubation of guinea pig carcasses to observe Clostridia proliferation and invasion.

    • Main Results:

    • All tested sheep muscle samples (n=68) were sterile, regardless of pre-slaughter stress or storage conditions.
    • Injected bacteria remained within the intestinal lumen of mouse carcasses; penetration required tissue disruption by enzymes.
    • Clostridia proliferated in guinea pig intestines but only invaded tissues after stomach rupture due to proteolysis (2-3 days post-mortem).

    Conclusions:

    • Bacterial invasion of sheep muscle tissue from the intestine is unlikely under normal post-mortem conditions.
    • The intestinal barrier remains intact until significant tissue degradation occurs, preventing early microbial translocation.
    • Deep meat spoilage by bacteria like Clostridia is a later event, dependent on structural breakdown and organ rupture.