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Bovine ostertagiasis: a changing epidemiological pattern?

K Bairden, J J Parkins, J Armour

    The Veterinary Record
    |July 14, 1979
    PubMed
    Summary
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    Clinical bovine ostertagiasis occurred in calves on silage aftermath due to delayed emergence of Ostertagia ostertagi L3 larvae from soil. This unusual pattern highlights potential risks even after anthelmintic treatment and pasture management.

    Area of Science:

    • Veterinary Parasitology
    • Epidemiology
    • Ruminant Health

    Background:

    • Bovine ostertagiasis is a common parasitic gastrointestinal disease in cattle.
    • Typical infection patterns involve larval ingestion from contaminated pastures.
    • Anthelmintic treatment and pasture management are standard control strategies.

    Purpose of the Study:

    • To describe an unusual epidemiological pattern of bovine ostertagiasis.
    • To investigate the source of infection in calves grazing silage aftermath.
    • To identify potential failures in parasite control strategies.

    Main Methods:

    • Clinical case observation in calves.
    • Analysis of herbage larval counts.
    • Epidemiological investigation of pasture history and treatment records.

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    Main Results:

    • Clinical ostertagiasis manifested in calves grazing silage aftermath in late July.
    • Calves had been treated with levamisole before grazing.
    • Pasture had not been grazed since the previous autumn.
    • Herbage larval counts suggested delayed emergence of overwintered Ostertagia ostertagi L3.

    Conclusions:

    • Delayed emergence of overwintered Ostertagia ostertagi L3 from soil is the probable cause of this unusual outbreak.
    • Standard control measures may not always prevent infection due to atypical parasite behavior.
    • Further research into overwintering larval dynamics is warranted.