1. Procedure 905. 02 in Official Methods of Analysis,1990
2. Procedure 920. 29 in Official Methods of Analysis,1990
3. Procedure 984. 13 in Official Methods of Analysis,1990
4. Kinetic analysis of urea transport from plasma to milk in dairy cows;Baker;J. Dairy Sci.,1992
5. Bani, P., G. Bertoni, L. Calamari, and V. Cappa. 1991. Relationships among dietary proteins, rumen ammonia and blood ammonia and urea. Pages 167-169 in Proc. 6th Int. Symp. Protein Metab. Nutr. EAAP Publication no. 59. Natl. Inst. Anim. Sci., Foulum, Denmark.