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Zinc-65 Uptake by Rumen Tissue

Animal Science Department, University of Illinois, Urbana, Illinois

Studies in vivo and in vitro were conducted to determine the uptake of zino by the rumen tissues of lamb. Absorption of ⁶⁵Zn by the rumen tissue was estimated following oral and intravenous administrations. The maximum uptake of ⁶⁵Zn by rumen tissue of orally administered and intravenously administered zinc was at 48 and 12 hours, respectively. The uptake of ⁶⁵Zn per kilogram of rumen tissue was significantly greater (P < 0.01) than the uptake per kilogram of abomasal, duodenal or intestinal tissue. One experiment in vitro (replicated twice) was carried out to determine ⁶⁵Zn uptake by rumen tissue. The mucosal surface of rumen tissue absorbed 71.2 ± 2.9% ⁶⁵Zn from buffered nutrient solutions. The results indicated that rumen tissue zinc uptake might be a process of absorption other than the concentration gradient.

Manuscript received 15 June 1968.

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