RESUMO
The reappearance of nematode eggs in faeces after ivermectin treatment was studied in 104 horses on 10 farms during the stabling period. Faecal samples were taken at weekly intervals. Sampling was discontinued when the mean egg output per farm was > 10% of the pre-treatment egg output. This point was reached after 63 days, when the mean output of eggs had decreased to 70.3%. Before treatment, 95.9% of the cultured larvae were of the cyathostome type, the others belonged to Gyalocephalus capitatus, Strongylus vulgaris, S. edentatus, Oesophagodontus/Poteriostomum spp., Triodontophorus spp. and Trichostrongylus axei. After treatment, the cultures nearly always produced 100% cyathostome larvae, although occasionally low numbers (< 1%) of larvae of large strongyles (mainly S. edentatus, rarely S. vulgaris and Oesophagodontus spp.) and T. axei were seen.
Assuntos
Doenças dos Cavalos/tratamento farmacológico , Ivermectina/uso terapêutico , Infecções por Nematoides/veterinária , Animais , Fezes/parasitologia , Doenças dos Cavalos/parasitologia , Cavalos , Infecções por Nematoides/tratamento farmacológico , Infecções por Nematoides/parasitologia , Contagem de Ovos de Parasitas/veterinária , RecidivaAssuntos
Benzimidazóis/farmacologia , Nematoides/efeitos dos fármacos , Infecções por Nematoides/veterinária , Doenças dos Ovinos/parasitologia , Animais , Benzimidazóis/uso terapêutico , Resistência a Medicamentos , Fezes/parasitologia , Hemoncose/tratamento farmacológico , Hemoncose/parasitologia , Hemoncose/veterinária , Haemonchus/efeitos dos fármacos , Infecções por Nematoides/tratamento farmacológico , Infecções por Nematoides/parasitologia , Países Baixos , Contagem de Ovos de Parasitas/veterinária , Ovinos , Doenças dos Ovinos/tratamento farmacológicoRESUMO
A survey to determine the prevalence of anthelmintic resistance of horse strongyles was carried out with 616 horses on 22 farms. The tested drugs were cambendazole, pyrantel pamaote and ivermectin. Based on egg count reduction tests the efficacy of cambendazole varied from 0% to 93% and of pyrantel from 93% to 100%. Ivermectin treatments were 100% effective on all farms. Larval cultures after cambendazole treatments revealed exclusively cyathostome larvae. After pyrantel treatments besides cyathostome larvae other types of larvae were also found. After ivermectin treatments only a few cyathostome larvae were observed. It can be concluded that benzimidazoleresistance of cyathostomes is very common and widespread in the Netherlands. This means that benzimidazoles and pro-benzimidazoles should be excluded for strategic use in horses.
