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Relative Absorption and Excretion by Beef Cattle of Copper from Various Sources^1,2,

The Agricultural Research Laboratory Operated by University of Tennessee for U. S. Atomic Energy Commission, Oak Ridge, Tennessee

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.

¹ Published with the approval of the Director of the Tennessee Agricultural Experiment Station and the Florida Agricultural Experiment Stations. The radioactive materials in these studies were obtained from the Oak Ridge National Laboratory on allocation from the United States Atomic Energy Commission. This study was completed under contract number AT-40-1-Gen-242 between the University of Tennessee College of Agriculture and the Atomic Energy Commission.

² The authors wish to express appreciation to R. C. McIlhenny, Radiochemist, UT-AEC Agricultural Research Laboratory; R. B. Grainger and J. W. Lassiter, Research Participants, UT-AEC Agricultural Laboratory: J. V. McLeod, Everglades Experiment Station; and others who assisted in the completion of these experiments.

³ Research Participant, Oak Ridge Institute of Nuclear Studies, on leave from the Everglades Experiment Station, Belle Glade, Florida.