Ten experiments were conducted to study the effects of potentially important factors on the zinc content of cattle hair. In Holsteins the order of descending amounts of zinc in hair were white tail, black body, and white body. Jersey fawn had slightly more zinc than black Holstein hair. The distal and proxinml ends of the hair contained the same amounts. Hair from the neck and rib areas tended to have more zinc than that from the leg regions. There were no differences in hair from the para lumbar fossa and the gluteal regions. Hair from five-month-old heifers had more zinc than that of either young or aged cows which were not different.
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Miller et al. (1965) studied this question.