multispecies resistance of cattle gastrointestinal nematodes to long-acting avermectin formulations in mato grosso do sul.the use of long-acting avermectins (avms) in cattle to treat infections with gastrointestinal nematodes was common in brazil until its prohibition by state authorities. the prohibition; however, was rescinded in 2015, but a scientific discussion of the pros and cons of the use of these formulations is necessary. we evaluated the levels of resistance to 1.0 and 3.5% doramectin and to 3.15% ivermectin in cattle. the worms in animals treated with 3.5% doramectin were characterized by the suppressio ...201526129974
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