AN 28 - Easy-to-Use Combustion Module-CRDS System for Rapid Verification of Delta 13 C Ratios in Beef Labeled Grass-Fed

In this application note we tabulate the δ13C values of store-bought ground beef bearing the grass-fed label and compared them against δ13C values of beef not labeled as grass-fed which we assumed to have consumed corn in significant amounts during the period it spent in a feedlot during the last months of its life. The values indicate (assuming accurate product labeling and disclosure) that beef raised on a strict grass diet has δ13C values that appeart o be clearly distinguished from beef from corn-fed/corn-finished cattle and from beef that is grassfed for much of its life but then grain-finished (or fed a grain diet) for the last few weeks of its life.