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Related Concept Videos

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Anthelminthic Agents

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Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
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Selective therapy in equine parasite control--application and limitations.

M K Nielsen1, K Pfister2, G von Samson-Himmelstjerna3

  • 1M.H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY, USA.

Veterinary Parasitology
|April 8, 2014
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Summary

Selective therapy for equine parasites, using fecal egg counts, shows promise but needs more research. This approach may not fully control all parasite types and requires further evaluation in young horses and potential health risks.

Keywords:
Egg countHelminthsHorsesParasite controlSelective therapy

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Area of Science:

  • Equine parasitology
  • Veterinary medicine
  • Anthelmintic resistance

Background:

  • Equine parasite control traditionally relies on frequent anthelmintic treatments.
  • Rising anthelmintic resistance in cyathostomins and Parascaris equorum necessitates a shift towards surveillance-based approaches.
  • Selective therapy, successful in small ruminants, is being explored for horses.

Purpose of the Study:

  • To evaluate the efficacy and safety of selective therapy in equine parasite control.
  • To determine if selective therapy adequately controls various equine parasites beyond cyathostomins.
  • To assess the impact of selective therapy on anthelmintic resistance development and potential health risks.

Main Methods:

  • Fecal egg counts performed on all horses to identify individuals exceeding a treatment threshold.
  • Application of selective therapy principles to horse populations, with a focus on evaluating its effectiveness in foals and young horses.
  • Review of existing studies and identification of knowledge gaps regarding selective therapy's impact on different parasite types and equine health.

Main Results:

  • Selective therapy has shown success in controlling cyathostomin egg shedding in adult horses, treating approximately half the population.
  • Limited data exists on selective therapy's effectiveness in foals and its control over tapeworms, ascarids, and large strongyles.
  • One study linked selective therapy to an increased occurrence of Strongylus vulgaris, highlighting potential health risks.

Conclusions:

  • Selective therapy is a promising concept for equine strongyle control but requires further scientific validation.
  • More research is needed to evaluate potential health risks, impact on anthelmintic resistance, and its efficacy in young horses.
  • Improved diagnostic and surveillance methods are crucial, and equine health parameters must be integrated into parasite control program evaluations.