Resistance of Haemonchus contortus to monepantel in sheep: first report in Espírito Santo, Brazil

Autor: Marcus Vinicius Gonçalves Viana, Ygor Henrique da Silva, Isabella Vilhena Freire Martins, Fabio Barbour Scott
Jazyk: English<br />Spanish; Castilian<br />Portuguese
Rok vydání: 2021
Předmět:
Zdroj: Revista Brasileira de Parasitologia Veterinária, Vol 30, Iss 4 (2021)
Druh dokumentu: article
ISSN: 1984-2961
DOI: 10.1590/s1984-29612021089
Popis: Abstract The objective of this study was to provide the first report of resistance of Haemonchus contortus to monepantel in sheep in Espírito Santo. The study was conducted in a property with history of monepantel use since 2014 and register of low efficacy in studies conducted over the past few years with fecal egg count reduction test. Lambs born on the property (males and females aged approximately 100 days) were selected and after eggs per gram of feces (EPG) analysis on fecal samples, these were divided into two groups: a group treated with monepantel (2.5 mg / Kg) and a control group without anthelmintic treatment. Seven days later, the animals were euthanized to recover parasites from the gastrointestinal tract. The efficacy of the treatment was 61.35% against H. contortus, thus proving that anthelmintic resistance to monepantel was present.
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