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Abstract
Extract
The important external parasites of cattle in New Zealand include the cattle tick, Haemaphysalis longicornis, which occurs mainly in northern districts, the biting louse, Damalinia bovis, and the long-nosed sucking louse, Linognathus vituli. There are two other lice, Haematopinus eurysternus, and Solenopotes capillatus but they are much less common. The mange mite, Chorioptes bovis, occurs mainly in the winter months and causes lesions on the legs, tail and escutcheon, and in bulls it may cause severe scrotal mange similar to that seen in rams. Demodex folliculorum causes lesions deep in the skin and these constitute a serious problem in the leather industry. Stable flies, Stomoxys calcitrans, are blood suckers and their attacks worry cattle on pasture and in the milking sheds. At milking time they may inhibit milk let-down and the teat cups may be kicked off by restless cows. Warble flies, Hypoderma spp., are seen only in imported cattle and have never become established in New Zealand.