anthelmintic resistance in northern ireland (i): prevalence of resistance in ovine gastrointestinal nematodes, as determined through faecal egg count reduction testing.the prevalence of anthelmintic resistance in northern ireland sheep flocks was evaluated between july and october 2011. sampling kits were sent to 172 flock owners and returns were received from 91. within this survey population, 27 flock owners used benzimidazole products, 10 used levamisole products, 15 used avermectin products, 26 used milbemycin products and 4 flock owners used the amino acetonitrile derivative, monepantel. the remaining 9 flock owners used combination drenches (broad spectr ...201323398988
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