There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.
Abstract
A survey was conducted on the occurrence of anthelmintic resistance of trichostrongylids
on commercial sheep farms in the highveld of Zimbabwe. On ten farms the efficacy of
fenbendazole, levamisole and rafoxanide was tested by a faecal egg count reduction
test. Benzimidazole resistance was additionally examined using an egg hatch assay
with thiabendazole. Results of the faecal egg count reduction tests and larval differentiations
showed fenbendazole resistance of Haemonchus sp. on all investigated farms. Resistance
of Haemonchus sp. against rafoxanide was demonstrated on all farms with reliable egg
counts. Levamisole resistance of Haemonchus sp. was found on most farms but 2 farms
showed an efficacy of 100%.