Multispecies resistance of cattle gastrointestinal nematodes to long-acting avermectin formulations in Mato Grosso do Sul

•Long-acting avermectins were evaluated by an anthelmintic controlled test in cattle.•Multiple nematode species resistance to avermectins was detected.•The increase of avermectin concentration did not result in higher efficacy. The use of long-acting avermectins (AVMs) in cattle to treat infections...

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