Comparison of Four Markers for Quantifying Microbial Protein Flow from the Rumen of Lactating Dairy Cows*
Keywords: microbial marker; 15N; purines; dairy cowA, adenine; APE, atom percent excess; FAB, fluid-associated bacteria; FP, omasal fluid phase; G, guanine; HX, hypoxanthine; LP, omasal large particle phase; NANMN, nonammonia non-microbial N15; NB, 15N background;