Parasite diversity and anthelmintic resistance in two herds of horses

K.E. Young; V. Garza; K. Snowden; R.J. Dobson; D. Powell; T.M. Craig

doi:10.1016/S0304-4017(99)00100-4

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Parasite diversity and anthelmintic resistance in two herds of horses

Journal article

Peer reviewed

Parasite diversity and anthelmintic resistance in two herds of horses

K.E. Young, V. Garza, K. Snowden, R.J. Dobson, D. Powell and T.M. Craig

Veterinary Parasitology, Vol.85(2-3), pp.205-214

1999

DOI: https://doi.org/10.1016/S0304-4017(99)00100-4

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Abstract

Cyathostomes were the predominant group of worms present in both herds. Trichostrongylus axei was seen in both herds, but Strongylus equinus, Strongylus vulgaris, Gyalocephalus capitatus, Poteriostomum spp. and Strongyloides westeri were only found in the feral horses. Larvae of Strongylus edentatus were found in a single domesticated horse. Fecal egg reduction tests with the domesticated herd showed a 32% egg count reduction for fenbendazole, a 93% reduction with pyrantel, and a 99% reduction with ivermectin. From the LDA, anthelmintic resistance was evaluated by determining the resistance ratio of the domesticated herd compared with the feral herd. For benzimidazoles in the domesticated herd, 45% of the cyathostome population was 9.4 times more tolerant than the feral herd's parasite population. The parasite population in the domesticated herd was 1.5 times more tolerant to Levamisole, and 1.7 times more tolerant to the benzimidazole/levamisole combination than the parasite population within the feral herd. 9% of the parasite population in the domesticated herd was 90 times more tolerant to avermectins than the feral herd's parasite population, even though a subpopulation of worms in the feral herd were tolerant to low concentrations of avermectins despite never being previously exposed to this class of anthelmintic.

Details

Title: Parasite diversity and anthelmintic resistance in two herds of horses
Authors/Creators: K.E. Young (Author/Creator) - Texas A&M University
V. Garza (Author/Creator) - Texas A&M University
K. Snowden (Author/Creator) - Texas A&M University
R.J. Dobson (Author/Creator) - McMaster-Carr
D. Powell (Author/Creator) - University of Maryland, College Park
T.M. Craig (Author/Creator) - Texas A&M University
Publication Details: Veterinary Parasitology, Vol.85(2-3), pp.205-214
Publisher: Elsevier BV
Identifiers: 991005545129107891
Copyright: © 1999 Elsevier Science B.V.
Murdoch Affiliation: Murdoch University
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 1 Clinical & Life Sciences; 1.163 Parasitology - General; 1.163.1022 Anthelmintic Resistance
Web Of Science research areas: Parasitology; Veterinary Sciences
ESI research areas: Plant & Animal Science