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Short Communication

The occurrence of anthelmintic-resistant sheep nematodes in the southern North Island of New Zealand

Pages 151-152 | Accepted 30 Sep 1993, Published online: 22 Feb 2011
 

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.

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