The occurrence of anthelmintic-resistant sheep nematodes in the southern North Island of New Zealand
- 8 January 1994
- journal article
- research article
- Published by Taylor & Francis in New Zealand Veterinary Journal
- Vol. 42 (4) , 151-152
- https://doi.org/10.1080/00480169.1994.35807
Abstract
An analysis of veterinary diagnostic cases submitted to the Batchelar Animal Health Laboratory for faecal egg count reduction testing in sheep between 1986 and 1992 showed that 63% of them originated from properties carrying anthelmintic-resistant worms. Most of these cases involved resistance to a single drench type only, with the benzimidazoles being implicated most frequently. Overall, the figures suggested a frequency of occurrence of resistance to benzimidazole anthelmintics of 74%, to levamisole-type anthelmintics of 23% and to benzimidazole-levamisole combinations of 30%. No cases of resistance to milbemycin/avermectin-type drenches were recorded.Keywords
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