Resistance to benzimidazole anthelmintics in cattle in New Zealand

Authors: McKenna PB
Publication: New Zealand Veterinary Journal, Volume 39, Issue 4, pp 154-155, Dec 1991
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Alimentary system/gastroenterology, Animal remedies/veterinary medicines, Anthelmintics, Parasite control, Parasites - internal, Nematode, Treatment/therapy
Article class: Correspondence

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Abstract: Although resistance to anthelmintics by nematode parasites of sheep and goats is common in many parts of the world including New Zealand, in cattle it has been detected only infrequently. So far, there have been only five such cases documented worldwide with two of these being recorded in New Zealand. At the Batchelar Animal Health Laboratory, the first case of suspected anthelmintic resistance in cattle was detected in October 1988 when positive faecal egg counts of up to 800 eggs per gram were recorded in seven out of 10 Friesian calves 9 days after treatment with oxfendazole. A faecal egg count reduction (FECR) test carried out in the property 6 months later subsequently appeared to confirm this suspicion when 7 day post-oxfendazole treatment egg counts were found to have declined by only 84%. Since then, seven further cases of apparent…

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