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Metabolism of Lactate Isomers by Rumen Mucosa

Laboratory of Veterinary Biochemistry, State University of Utrecht, Utrecht, The Netherlands

ABSTRACT

Sheets of rumen epithelium from several ruminant species were incubated with L-lactate or D-lactate as the only added substrate offered over a wide concentration range. With increasing concentrations of L-lactate, increasing amounts of carbon dioxide were produced, usually more acetoacetate was synthesized, and more oxygen was taken up by the tissue.

With increasing concentrations of D-lactate as a substrate, carbon dioxide production was increased, but formation of ketone bodies and oxygen uptake showed no direct relationship with the substrate level. The rate of carbon dioxide formation from D-lactate was generally lower than that from the L-isomer.