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Availability and Metabolism of Various Substrates in Ruminants. I. Absorption and Metabolism of Acetate¹

Department of Dairy Science, University of Illinois

ABSTRACT

Two experiments were conducted in which K-acetate-1-C¹⁴ was either injected or infused intravenously into a mature dairy steer to obtain measurements of pool size, turnover rate, and turnover time of blood acetate. Estimates were made of the amount of acetate absorbed and metabolized to carbon dioxide following feeding.

It was shown that a single injection of K-acetate-1-C¹⁴ is not applicable to the measurement of acetate pool size or turnover rate because of its apparent rapid metabolism before complete mixing with the unlabeled acetate in the pool is effected. However, the turnover time of the acetate pool was calculated to be 83 min.

The amount of acetate entering the pool after the consumption of 4.3 lb. of grain was estimated to be 67.24 g. per hour. Of this amount, 50% was oxidized to CO₂ and 50% was metabolized via other routes. The acetate oxidized accounted for 50% of the expired carbon dioxide.

¹ Supported in part by a grant from the Rockefeller Foundation.

² The data presented are from a thesis submitted by the senior author to the Graduate College, University of Illinois, in partial fulfillment of the requirements for the degree of Doctor of Philosophy.