Abstract
Although resistance to anthelmintics by nematode parasites of sheep and goats is common in many parts of the world including New Zealand (1) Wailer, P J . 1986. Anthelmintic resistance in nematode parasites of sheep. Agricultural Zoology Reviews, 1: 333–373. [Google Scholar] (2) McKenna, P B . 1991. “Update on drench resistance”. In Practical Aspects of Internal Parasite Control, 55–60. Proceedings of the 21st Seminar of the Sheep and Beef Cattle Society of the New Zealand Veterinary Association. [Google Scholar] , 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 (Table I).

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