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Chlorate poisoning in beef cattle.

Barry R Blakley¹, Lorrie M Fraser, Cheryl Waldner

¹Department of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan. barry.blakley@usask.ca

The Canadian Veterinary Journal = La Revue Veterinaire Canadienne

|November 9, 2007

Summary

Improper disposal of sodium chlorate herbicide caused a fatal disease syndrome in Limousin cattle. Symptoms included hemolysis and methemoglobinemia, with severity linked to herbicide consumption levels.

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Area of Science:

Veterinary Toxicology
Animal Pathology
Environmental Health

Background:

Beef cattle grazing practices in Alberta.
Potential environmental hazards associated with herbicide disposal.
Clinical signs of toxicological syndromes in livestock.

Observation:

A herd of Limousin beef cattle exhibited a severe disease syndrome.
Clinical signs included hemolysis, methemoglobinemia, and methemoglobinuria, leading to death.
Cattle were grazing on pasture during November.

Findings:

The causative agent was identified as the nonselective herbicide, sodium chlorate.
Improper disposal of sodium chlorate was the source of exposure.
Variable blood methemoglobin levels correlated with individual herbicide intake.

Implications:

Highlights the risks of improper herbicide disposal in livestock environments.
Underscores the need for strict adherence to waste management protocols for agricultural chemicals.
Informs veterinary diagnostic approaches for similar toxicological cases in cattle.