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Related Experiment Videos

Suspected ergotism in two heifers.

D M Fraser, P R Dorling

    Australian Veterinary Journal
    |October 1, 1983
    PubMed
    Summary

    Friesian heifers developed gangrenous ergotism from consuming rye grass seed heads infected with Claviceps purpurea ergot. This resulted in hind limb lameness, gangrene, and tissue necrosis due to vasoconstriction.

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    Area of Science:

    • Veterinary Medicine
    • Toxicology
    • Ruminant Health

    Background:

    • Ergot alkaloids, produced by fungi like Claviceps purpurea, are known phytotoxins.
    • Ergotism in livestock can manifest in various forms, including gangrenous and convulsive syndromes.
    • Perennial rye grass (Lolium perenne) is a common pasture grass susceptible to ergot infection.

    Observation:

    • Two Friesian heifers exhibited clinical signs consistent with gangrenous ergotism.
    • The affected heifers grazed on meadow hay containing perennial rye grass seed heads.
    • Parasitism of the seed heads by an ergot, presumed to be Claviceps purpurea, was identified.

    Findings:

    • Clinical signs included bilateral hind limb lameness and visible gangrene.
    • Angiographic examination revealed vasoconstriction in the lower hind limbs.
    • Necrosis of distal tissues in both hind limbs was observed, correlating with reduced blood flow.

    Implications:

    • This case highlights the risk of Claviceps purpurea ergotism in cattle grazing infected rye grass.
    • Early identification and removal of contaminated forage are crucial for preventing ergotism.
    • Understanding the vascular effects of ergot alkaloids is important for veterinary diagnosis and treatment.

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