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A survey of benzimidazole resistant nematodes in sheep in three countries of southern England
  1. C Hong,
  2. KR Hunt,
  3. TJ Harris,
  4. GC Coles,
  5. WT Grimshaw and
  6. PF McMullin


Faecal samples were collected from 209 randomly selected sheep farms in southern England, and the nematode eggs extracted were tested by an egg hatch assay and by a larval development test for their resistance to benzimidazoles. Benzimidazole resistance was found on 35 per cent of farms tested in East Sussex, 44 per cent in Oxfordshire and 61 per cent in West Sussex.

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