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Related Experiment Videos

Absorption by sheep of dieldrin from contaminated soil

M W Paton1, D S Petterson

  • 1Avon Districts Agriculture Centre, Agriculture Western Australia, Northam.

Australian Veterinary Journal
|June 1, 1997
PubMed
Summary

Sheep exposed to dieldrin-contaminated soil accumulate residues in body fat. Soil type significantly impacts accumulation, with organic and clay soils leading to higher levels than sandy soils.

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Area of Science:

  • Environmental Toxicology
  • Veterinary Science
  • Agricultural Chemistry

Background:

  • Pesticide contamination of soils poses risks to livestock.
  • Understanding residue accumulation in sheep is crucial for food safety and animal health.

Purpose of the Study:

  • To investigate the accumulation and persistence of dieldrin residues in sheep following ingestion of contaminated soils.
  • To evaluate the influence of soil type on dieldrin accumulation in sheep.

Main Methods:

  • Controlled feeding studies involving sheep (Ovis aries) exposed to dieldrin-contaminated soils of varying types (sandy, high clay, high organic matter) and water-soluble dieldrin.
  • Analysis of dieldrin concentrations in body fat and wool over specified periods.
  • Determination of dieldrin half-life in sheep fat.

Main Results:

  • Dieldrin accumulation in sheep body fat was approximately half when ingested via contaminated soil compared to water-soluble forms.
  • Soil type significantly affected accumulation: organic matter-rich soils led to nearly threefold higher residues, and clay-rich soils to fourfold higher residues than sandy soils.
  • The half-life of dieldrin in sheep fat ranged from 96 to 116 days.

Conclusions:

  • Dieldrin residues in sheep fat decrease within 10 days after removing the source of contamination.
  • Dieldrin residues accumulate in sheep wool when contaminated soil is ingested.

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