Syväoja, Eeva-Liisa, and Matti Kreula. “Incorporation of 15N and 14C into Amino Acids of Bacterial and Protozoal Protein in the Rumen of the Cow on Urea-Rich Feed”. Agricultural and Food Science 51, no. 1 (January 1, 1979): 497–505. Accessed November 23, 2024. https://journal.fi/afs/article/view/72011.