Influence of Ration Copper on Minerals in the Hair of Hereford and Holstein Calves2

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Abstract
COPPER (Cu) deficiency has been reported as causing depigmentation of hair in cattle (Davis, 1950; Davis, Kidder and Comar, 1946) and a dull, discolored coat (Allcroft and Lewis, 1957). Davis (1958) suggested that interaction of molybdenum (Mo) and Cu may cause achromotrichia of the hair through the suppression by Mo of the copper-activated enzyme, tyrosinase. Vanderveen and Keener (1964) reported that Holstein heifers on a low Cu diet (2 ppm) and from 5 to 50 ppm of Mo did not develop loss of hair color, but other animals receiving 50 ppm of Mo did develop loss of hair color after 225 days. Chapman and Bell (1963) reported on the availability of various compounds of copper and their absorption and excretion patterns in beef cattle. The purpose of this study was to determine the influence of dietary copper on the pigmentation of hair and the concentration of copper, sodium, zinc, calcium, phosphorus, magnesium, manganese, iron and potassium in the hair of calves. Copyright © 1970. American Society of Animal Science. Copyright 1970 by American Society of Animal Science

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