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Chlorpyrifos intoxication in a bull.
Journal of the American Veterinary Medical Association
|June 15, 1986
Summary
A Brangus bull experienced organophosphate poisoning from chlorpyrifos, showing reduced cholinesterase activity. Prompt treatment with pralidoxime and supportive care led to recovery and satisfactory breeding potential.
Area of Science:
- Veterinary Toxicology
- Animal Reproduction
Background:
- Organophosphate pesticides, such as chlorpyrifos, are widely used in livestock management.
- Understanding the toxic effects and treatment protocols for pesticide exposure in cattle is crucial for animal health and agricultural productivity.
Observation:
- A mature Brangus bull exhibited dullness and inappetence three days post-administration of a recommended chlorpyrifos dose.
- Clinical signs included weakness, dehydration, and gastrointestinal dysfunction (rumen stasis and distention).
- Blood cholinesterase activity was significantly depressed, measured at 25% of normal levels.
Findings:
- Treatment with pralidoxime, antimicrobials, electrolyte solutions, vitamins, and adsorbents resulted in clinical improvement.
- Five weeks post-exposure, the bull regained weight, and blood cholinesterase activity recovered to 70% of normal.
- Seminal evaluation confirmed the bull as a satisfactory potential breeder, indicating full reproductive recovery.
Implications:
- This case highlights the potential for chlorpyrifos toxicity in cattle, even at recommended doses.
- Effective treatment strategies involving cholinesterase reactivators like pralidoxime are vital for managing organophosphate poisoning in bulls.
- Recovery of reproductive function post-treatment is essential for maintaining breeding programs in affected herds.