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Related Experiment Videos

Dieldrin toxicity in housed merino sheep.

J R Glastonbury, R I Walker, D J Kennedy

    Australian Veterinary Journal
    |May 1, 1987
    PubMed
    Summary

    Dieldrin poisoning caused deaths and reproductive failure in Merino sheep. Investigations confirmed dieldrin residues and suggested vitamin A deficiency may have also contributed to the reproductive issues.

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    Area of Science:

    • Veterinary Toxicology
    • Sheep Production Medicine
    • Environmental Contaminant Effects

    Background:

    • Investigated an outbreak of nervous disease, mortality, and reproductive failure in a flock of 640 Sharlea Merino sheep.
    • The outbreak occurred within 4 months following dieldrin dipping treatment.

    Purpose of the Study:

    • To diagnose the cause of a severe disease outbreak in a commercial sheep flock.
    • To identify the etiological agent responsible for high mortality and complete reproductive failure.

    Main Methods:

    • Clinical examination of affected sheep.
    • Post-mortem pathological assessments.
    • Toxicological analysis of tissue samples for dieldrin residues.
    • Assessment of vitamin A status in affected animals.

    Main Results:

    • Seventy adult sheep died, and no live lambs were born.
    • Clinical signs, pathological findings, and dieldrin tissue residues confirmed dieldrin poisoning.
    • Vitamin A deficiency was identified in two sheep, potentially exacerbating reproductive failure.

    Conclusions:

    • Dieldrin exposure was the primary cause of mortality and reproductive failure in the flock.
    • Vitamin A deficiency may have played a secondary role in the observed reproductive issues.
    • Highlights the risks of organochlorine pesticide use in livestock environments.

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