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Availability and Metabolism of Various Substrates in Ruminants. III. The Effect of Propionate on Acetate Oxidation in Vivo

Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

An aqueous solution of the sodium salts of acetic acid and acetic acid—1-C¹⁴ were infused with and without sodium propionate into the jugular vein of a mature dairy steer for periods of 7 hr.

The expired gases were metered, sampled, and analyzed for CO₂ content and its radioactivity determined. From the specific activity of the expired CO₂ and the total CO₂ output, the amount of the infused acetate oxidized was determined. It was shown that propionate fails to inhibit acetate oxidation as drastically as has been observed in vitro. The infusion of propionate with acetate caused a 23.5% reduction in the total volume of CO₂ expired as compared to the infusion of acetate alone. Although the rate of acetate oxidation was slightly depressed and the CO₂ output markedly reduced by propionate, the percentage of the expired CO₂ derived from infused acetate was the same for acetate and acetate plus propionate (21.38 and 21.65%, respectively).

¹ Present address: Department of Dairy Science, The Ohio State University, Columbus 10, Ohio.