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Published online by Cambridge University Press: 27 February 2018
As the initial part of a research programme to assess the importance of geochemical factors in livestock production, a survey has been conducted on the copper (Cu) content of whole blood samples from cattle analyzed by the Veterinary Investigation Service over the period 1977-1980 inclusive. The area covered was restricted to England and the Welsh borders; data for Wales were not included, as they were not of a strictly comparable form, being based on plasma rather than on whole blood analysis.