1. Effect of dietary concentrate on rumen fermentation, digestibility, and nitrogen losses in dairy cows;Agle;J. Dairy Sci.,2010
2. Official methods of analysis;AOAC,1990
3. Method of determining and expressing particle size of chopped forage materials by screening;ASABE,2007
4. Nitrogen metabolism in the rumen;Bach;J. Dairy Sci.,2005
5. Excretion of purine derivatives by sheep and cattle and its use for the estimation of absorbed microbial protein;Chen,1989