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Intestinal parasitism

Last edited: 4/16/2026

Overview

Intestinal parasitism in horses primarily involves helminths, significantly impacting equine health in developed regions through various clinical manifestations including gastrointestinal disturbances and malnutrition 1.

Diagnosis

  • Clinical signs: Weight loss, diarrhea, anemia, and poor coat condition 1.
  • Fecal examination: Essential for detecting parasite eggs using techniques like flotation and sedimentation methods 1.
  • Serological tests: Useful for assessing exposure but not specific for active infection 1.
  • Post-mortem findings: Visual confirmation of parasitic burden in severe cases 1.

    • Management

  • Anthelmintics: Fenbendazole, ivermectin, and moxidectin are commonly used; specific dosing varies by parasite type and horse weight 1.
  • Targeted deworming programs: Based on fecal egg counts to minimize resistance development 1.
  • Environmental management: Regular manure removal and pasture rotation to reduce exposure 1.
  • Monitoring: Periodic fecal egg counts to assess efficacy and adjust treatment strategies 1.

    • Special Populations

  • Pregnant mares: Careful selection of anthelmintics to avoid teratogenic effects; consult specific guidelines for safe dosing 1.
  • Foals: More susceptible; frequent monitoring and targeted deworming strategies recommended 1.

    • Key Recommendations

  • Implement regular fecal egg counts to guide deworming strategies and minimize anthelmintic resistance development (Evidence: Moderate 1).
  • Use targeted anthelmintic treatments based on identified parasite species and fecal egg counts rather than routine administration (Evidence: Moderate 1).
  • Incorporate environmental management practices such as pasture rotation and manure removal to complement pharmacological interventions (Evidence: Expert opinion 1).

    • References

    1 Klei TR. Equine immunity to parasites. The Veterinary clinics of North America. Equine practice 2000. link30119-0)

    Original source

    1. [1]
      Equine immunity to parasites. — Klei TR The Veterinary clinics of North America. Equine practice (2000)
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