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Gastrointestinal Sites of Absorption and Endogenous Secretion of Zinc in Dairy Cattle¹

Agricultural Research Laboratory of The University of Tennessee, Oak Ridge²

ABSTRACT

Two nonabsorbed marker techniques (Ce¹⁴⁴Cl₃ and Cr₂O₃) were compared for determining sites of gastrointestinal absorption or secretion of radiozinc in dairy cattle. Zinc was absorbed from the abomasum and lower small intestine, whereas absorption or excretion below the cecum was negligible. Secretion of endogenous zinc occurred in the upper part of the small intestine. Net absorption of Zn⁶⁵ administered daily averaged 12% in mature cows, 20% in calves ranging from 5 to 12 months, and 55% in week-old calves. Values determined using Ce¹⁴⁴ and Cr₂O₃ as markers were in good agreement.

¹ This manuscript is published with the permission of the Director of the University of Tennessee Agricultural Experiment Station, Knoxville.

² Operated by the Tennessee Agricultural Experiment Station for the U. S. Atomic Energy Commission under contract No. AT-40-1-GEN-242.