Anthelmintic resistance in cattle nematodes in New Zealand: Is it increasing?

Authors: McKenna PB
Publication: New Zealand Veterinary Journal, Volume 44, Issue 2, pp 76, Apr 1996
Publisher: Taylor and Francis

Animal type: Livestock
Subject Terms: Alimentary system/gastroenterology, Animal remedies/veterinary medicines, Anthelmintics, Parasite control, Parasites - internal, Disease surveillance, Epidemiology, Nematode, Treatment/therapy
Article class: Correspondence
Abstract: In contrast to the situation in sheep, anthelmintic resistance in cattle nematodes in New Zealand appears to be relatively uncommon. A brief review in 1991 indicated that only six confirmed cases had been reported. All related to resistance to benzimidazole anthelmintics and involved infections of Cooperia and, to a lesser extent, Ostertagia and Trichostrongylus. Since then, however, a further 13 cases of benzimidazole resistance in cattle have been identified by faecal egg count reduction tests conducted on submissions to the Batchelar and Ruakura Animal Health Laboratories. In addition, another two cases have recently been detected by similar means by ethers. In the latter two instances, these not only involved resistance to benzimidazole drenches but to milbemycin/avermectin type anthelmintics as well…
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