The significance of Nematodirus in New Zealand

Abstract

Extract

Although Nematodirus species are commonlyfound in sheep in New Zealand, the worm had been considered to be of little economic importance until the period 1956–9 when a number of outbreaks of acute disease occurred in lambs; the condition was ascribed to heavy Nematodirus infestation. A similar situation had existed in the British Isles until about 1951 when outbreaks of acute nematodiriasis reached serious proportions.