Letter to the editor

Abstract

Extract

Sir, — Outbreaks of disease characterized by tremors and inco-ordination may occur in sheep and cattle grazing short, ryegrass-dominant pastures during summer and autumn. Animals appear normal on casual observation but when forced to move some distance may developed a high stepping gait stagger and fall to the ground for a brief period of either threshing or tonic muscular spasms of the legs (Cunningham and Hartley, 1959; Keogh, 1973). The syndrome appears to be most troublesome in New Zealand but occurs also in Australia and possibly in the U.S.A. and England.