Some observations on swayback disease of lambs

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Abstract
A brief account is given of the work done in these laboratories on swayback and a comparison is made with a similar disease occurring in Australia. The Australian disease is due to an uncomplicated Cu deficiency of soil and herbage, but it is shown that swayback in this country is due to neither a Cu deficiency of soil nor herbage but nevertheless the affected animals suffer from a Cu deficiency and respond to Cu medication.It is shown that ewes with a low blood Cu in Derbyshire on being transferred to Cambridge rapidly attained a normal blood Cu.Analyses of grass from widely separated swayback-affected areas showed that in no case was the Cu content low.A short discussion is given of the possibility of lead being implicated in the causation of the disease, but it is concluded that lead plays only a secondary role.In the discussion it is pointed out that there is much fluorspar in the affected area of Derbyshire.