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  • Title: A survey in Louisiana of intestinal helminths of ponies with little exposure to anthelmintics.
    Author: Torbert BJ, Klei TR, Lichtenfels JR, Chapman MR.
    Journal: J Parasitol; 1986 Dec; 72(6):926-30. PubMed ID: 3819969.
    Abstract:
    Ponies reared with minimal or no exposure to anthelmintics were surveyed for intestinal helminths in order to estimate prevalence and intensity of parasite populations unaltered by frequent exposure to anthelmintics. Thirty-seven mixed breed ponies of varying ages were examined. Thirty-four species of nematodes and 2 species of cestodes were found. Twenty-four of the nematode species (including 1 new species) were in the subfamily Cyathostominae (small strongyles). Eighty-seven percent of the total burden of adult small strongyles in the large intestine was composed of 10 species. By comparing the results of the present survey with those of recent surveys of horses from herds which had been subjected to treatments with anthelmintics, the effect of prolonged usage of anthelmintic treatment on the prevalence of individual species possibly can be estimated. The general ranking of the 10 most common cyathostome species was similar to those described in recent surveys of horses, suggesting that anthelmintic pressure does not affect the prevalence of most cyathostome species. The lack of anthelmintic treatment appeared not to affect prevalence rates for Anoplocephala perfoliata and Anoplocephala magna when compared to other studies. Conversely, prevalence rates for Strongylus spp., Triodontophorus spp., Craterostomum acuticaudatum, Oxyuris equi, and Parascaris equorum were higher than those reported for these species in recent studies of horses.
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