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    Anthelmintic-resistant nematodes in Irish commercial sheep flocks- the state of play

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    Author
    Good, Barbara
    Hanrahan, James P
    de Waal, Daniel Theodorus
    Patten, Thomas
    Kinsella, Andrew
    Lynch, Ciaran Oliver
    Keyword
    Anthelmintic resistance
    Nematodes
    Sheep Ireland
    Benzimidazole
    Levamizole
    Ivermectin
    MALDT
    FECRT
    Date
    2012-12-22
    
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    URI
    http://hdl.handle.net/11019/407
    Citation
    Good, B., Hanrahan, J.P., de Waal, D. T., Patten, T. Kinsella, A. and Lynch, C.O. Anthelmintic-resistant nematodes in Irish commercial sheep flocks- the state of play. Irish Veterinary Journal, (2012), 65(1):21. doi:10.1186/2046-0481-65-21
    Abstract
    Anthelmintic resistance has been reported in most sheep producing countries. Prior to the mid 1990s, reports of anthelmintic resistance in Ireland were sparse and focused on benzimidazole, one of the three classes of anthelmintic available during this period. This evidence for efficacy issues on Irish farms combined with awareness that anthelmintic resistance was increasingly being reported in other countries prompted the need for more comprehensive investigations on Irish farms. Faecal egg count reduction and micro-agar larval development tests were employed to investigate resistance to benzimidazole, levamisole and macrocyclic lactone. There is compelling evidence for resistance to both benzimidazole (>88% of flocks) and levamisole (>39% of flocks). Resistance of nematode populations to macrocyclic lactone was suspected on a small number of farms (11%) but needs to be confirmed. The recent introduction of two new classes of anthelmintics, after over a 25 year interval, together with the evidence that anthelmintic resistance is reported within a relatively short time following the introduction of a new anthelmintic compound means that the challenge to the industry is immediate. Actions are urgently required to manage anthelmintic resistance so as to prolong the lifespan of anthelmintics.
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1186/2046-0481-65-21
    Scopus Count
    Collections
    Agricultural Economics
    Teagasc publications in Biomed Central
    Animal & Bioscience

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