Agronomy Journal -- Powell et al. 96 (2): 433 Figure IG5

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Fig. 5. Atom% ¹⁵N in total fecal N and fecal undigested feed N of two dry dairy cows fed ¹⁵N-enriched forage. (Base of arrows marks the time when last offer of ¹⁵N-enriched forage was made.)