Measuring natural abundance of 13 C in respired CO 2 : variability and implications for non-invasive dietary analysis

1. Three experiments were performed, using laboratory mice ( Mus musculus ) as a model species, to evaluate the potential of using measurements of carbon isotope ratios in expired CO 2 for tracing diets. 2. Breath 13 C signatures of mice fed a constant diet (–21·4‰ ± 0·35) reflected their diet, but were depleted by on average –5·7‰. Body mass, sex and age… CONTINUE READING