Title: STABLE ISOTOPE CARBON CONTENT OF VARIOUS TISSUES IN CALVES
Abstract: There are major isotopic fractionation steps involved in the fixation of atmospheric CO 2 to form plant tissues. The objective of the present work was to determine if such fractionation occurs in metabolic animal processes. 13 C/ 12 C ratios were measured in various tissues. CO 2 expired was enriched, duodenal mucosa was similar and other tissues were depleted in 13 C compared to diet composition. Key words: Carbon 13, tissue composition, calf