Relative Absorption and Excretion by Beef Cattle of Copper from Various Sources1

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Abstract
Hereford steers were used in a series of experiments to determine the availability of copper from several sources using Cu-64 labeled compounds. Cupric oxide powder had a relatively low absorption rate and high rate of fecal excretion. Cupric oxide needles and Cu wire had a low absorption rate but merit further study because of their slower passage through the body. Cuprous oxide should be studied further, as it had a fair rate of absorption into the blood stream, but it is possible that this was offset by a relatively high urinary excretion. Cupric carbonate had the highest rate of absorption and highest rate of excretion in the urine and feces. Copper sulfate ranked 3rd in absorption rate, 6th urinary excretion and 5th in fecal excretion, indicating a favorable retention in the body tissues. Cupric nitrate and CuCl2 compared favorably with CuSO4 in absorption and excretion patterns. Copyright © 1963. American Society of Animal Science . Copyright 1963 by American Society of Animal Science