Anthelmintic resistance in gastrointestinal nematodes of beef cattle in the state of Rio Grande do Sul, Brazil
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<p id="p0010">Presence of multi-resistant populations of nematodes in all evaluated herds.p>
<p id="p0015">On 60% of the farms, nine of the ten active compounds tested had efficacies <90%.p>
<p id="p0020">All of the avermectins tested were ineffective in controlling nematode infection.p>
<p id="p0025">Cooperia spp. was the most resistant genus.p>
<p id="p0030">Increased efficacy using some drug combinations.p>

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