Anthelmintic resistance in commercial sheep farms in Costa Rica

 

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Detalles Bibliográficos
Autores: Castro Arnáez, Isabel Cristina, Álvarez Calderón, Victor, Soto Barrientos, Natalia, Montenegro Hidalgo, Victor Manuel, Vargas Leitón, Bernardo
Formato: artículo
Fecha de Publicación:2021
Descripción:Forty-eight commercial sheep farms were sampled between the years 2017 and 2019 to evaluate the percentage of reduction of the three families of broad-spectrum anthelmintic drugs available in Costa Rica - benzimidazoles (albendazole), macrocyclic lactones (ivermectin) and imidazothiazoles (levamisole) - in grazing animals by using the fecal egg count reduction test. Animals were selected based on their egg per gram counts after their fecal samples were processed by a modified McMaster technique. The remaining fecal samples were taken to the laboratory for fecal culture and larval identification. The prevalence of farms with albendazole resistance was 100%, ivermectin 96% and levamisole 17%. Seven (n = 47) farms resulted with triple resistance, 39 with double and 1 farm was resistant to 1 AH tested. Haemonchus spp. was the most commonly isolated parasite in pre- and post-treatment larval culture. This is the first report of Oesophagostomum spp. and Teladorsagia sp. resistant to albendazole, Oesophagostomum spp., Teladorsagia sp., Chabertia sp. and Cooperia sp. resistant to ivermectin, and the presence of strains of Haemonchus spp. and Trichostrongylus sp. resistant to the 3 anthelmintics tested. The results of this study demonstrate that anthelmintic resistance is widespread, particularly in Haemonchus spp., and that the major drugs available in the country have lost much of their effectiveness against sheep nematodes.
País:Repositorio UNA
Institución:Universidad Nacional de Costa Rica
Repositorio:Repositorio UNA
Lenguaje:Inglés
OAI Identifier:oai:https://repositorio.una.ac.cr:11056/21780
Acceso en línea:http://hdl.handle.net/11056/21780
Access Level:acceso abierto
Palabra clave:SHEEP
ANTHELMINTIC RESISTANCE
HAEMONCHUS SPP
GASTRO-INTESTINAL NEMATODES
DRENCH FAILURE
NEMATODA
PARASITOLOGIA VETERINARIA
GASTROENTEROLOGIA (MEDICINA VETERINARIA)
OVINOS
COSTA RICA