Detecting benzimidazole resistance with faecal egg count reduction tests and in vitro assays [anthelmintics; sheep parasites]
1989
Martin, P.J. | Anderson, N. (Commonwealth Scientific and Industrial Research Organization, Parkville (Australia). Div. of Animal Health) | Jarrett, R.G. (Melbourne Univ., Parkville (Australia). Statistical Consulting Centre)
Composite strains of Trichostrongylus colubriformis and Ostertagia of a range of known percent resistance were tested by FERT, in vitro egg hatch assays and tubulin binding assays. All tests detected resistance above 50 percent, none was unequivocally positive below 25 percent. In vitro tests gave better quantitative estimates of moderate to high resistance, but were no more sensitive than FERT at low levels. FERT is a suitable means of detecting field resistance, but tests more sensitive to low resistance levels are required.
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