Tolerance of Ponies to High Levels of Dietary Copper

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Abstract
Twenty yearling ponies were used to study the toxic effects of excess dietary copper. The pelleted diet which was fed for 6 months contained either 8, 262, 458 or 791 ppm copper. The increased copper produced no visible effects on the ponies. Whole blood or plasma copper concentrations were not elevated nor did plasma GOT and LDH levels indicate any liver damage from the increased dietary copper. Five ponies fed increased copper were pregnant and foaled normally 3 to 4 months after completion of the trial. Two of the ponies fed the highest copper level had tissue concentrations of copper in dry matter at termination as follows: liver, 4,294 and 3,445 ppm, kidney 125 and 94 ppm, skeletal muscle 6.6 and 3.0 ppm. Copyright © 1975. American Society of Animal Science . Copyright 1975 by American Society of Animal Science.

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