Benzimidazole resistance of sheep nematodes in Norway confirmed through controlled efficacy test |
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Authors: | Atle V Meling Domke Christophe Chartier Bj?rn Gjerde Snorre Stuen |
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Institution: | 1.Norwegian School of Veterinary Science, Sandnes, Norway;2.LUNAM Université, Oniris, Nantes-Atlantic College of veterinary medicine and food sciences and engineering, UMR BioEpAR, Nantes, F-44307, France;3.Norwegian School of Veterinary Science, Oslo, Norway |
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Abstract: | BackgroundResistance against benzimidazoles (BZ) has recently been detected in Norwegian sheep flocks through a large scale prevalence survey based on the faecal egg count reduction test (FECRT). The use of this test in combination with bulk larval culture only gives an indication of which gastrointestinal nematodes genera that are involved and these results have to be confirmed by a controlled efficacy test (CET) to get accurate information about resistant nematodes populations at species level. A CET was therefore performed with larvae from two flocks where BZ resistance was previously detected through FECRT.ResultsThe latter test confirmed the previous results in both flocks. In flock A, the BZ resistant nematode population consisted solely of Haemonchus contortus, whereas H. contortus and Teladorsagia circumcincta comprised the resistant worm population in flock B.ConclusionsSome discrepancies that have been recorded between FECRT and CET results regarding time for post-treatment coproscopical examination and a temporary suppression of faecal egg excretion are discussed. |
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Keywords: | Benzimidazole Anthelmintic resistance FECRT Controlled efficacy test Sheep |
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