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Nitrogen-15 Labeling of Dairy Feces and Urine for Nutrient Cycling Studies

^a USDA-ARS Dairy Forage Res. Ctr., 1925 Linden Dr. West, Madison, WI 53706 USA

View larger version (18K): [in a new window]   Fig. 1 Concentration of 15N in urine after feeding 15N-enriched forage

View larger version (18K): [in a new window]   Fig. 2 Concentration of 15N in feces after feeding 15N-enriched forage

View larger version (23K): [in a new window]   Fig. 3 Recovery of 15N in dairy feces and urine

View larger version (20K): [in a new window]   Fig. 4 Atom % 15N in total nitrogen (TN) and neutral-detergent insoluble nitrogen (NDIN) of dairy feces