nematode resistance to ivermectin (630 and 700μg/kg) in cattle from the southeast and south of brazil.two high doses of ivermectin (630μg/kg and 700μg/kg) that are sold commercially in brazil were evaluated in dose-and-slaughter trials with 144 naturally nematode-infected cattle from eight regions within the states of minas gerias, são paulo and rio grande do sul in brazil. treatment groups were based on fecal egg counts 1, 2, and 3days before treatment; all animals studied had a minimum egg count of at least 500 eggs per gram of feces (epg). post-mortem analyses were conducted on day 14. the hi ...201425130588
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