1. Association of Official Analytical Chemists (AOAC), 1990. Official Methods of Analysis, 15th ed. AOAC, Washington, DC.
2. Effects of a Saccharomyces cerevisiae culture on ruminal bacteria that utilize lactate and digest cellulose;Callaway;J. Dairy Sci.,1997
3. The effect of dietary inclusion of yeast culture on digestion in the sheep;Chademana;Anim. Prod.,1990
4. Excretion of purine derivatives by ruminants, effect of exogenous nucleic acid supply on purine derivative by sheep;Chen;Brit. J. Nutr.,1990
5. Chen, X.B., Ørskov, E.R., Hovell DeB., F.D., 1991. The use of intragastic infusion in studies on excretion of purine derivatives as a measure of microbial protein supply in ruminants. In: Eggum, B.O., Boisen, S., Borsting, C., Danfae, A., Hvelplund, T. (Eds.), Proceedings of the Sixth International Symposium on Protein Metabolism and Nutrition, vol. 2. National Institute of Animal Science Research Center, Foulum, p. 67.