1. Alexandrov, A.N., Atanassova, S.L., Peltekova, V.D., Broderick, G.A., Todorov, N.A., 1995. The use of near infrared spectroscopy for estimation of microbial contamination of in sacco forage residues and protein and dry mater degradability in the rumen. in: Nunes, A.F., Portugal, A.V., Costa, J.P., Ribeiro, J.R. (Eds.), Protein Metabolism and Nutrition, Proc. 7th Int. Symp. Prot. Metab. Nutrition, vale de Santarem, Portugal, 24–27 May, 1995. EAAP Publ. no. 81, Estacao Zootecnica National, Portugal, pp. 133–139.
2. AOAC, 1984. Official Methods of Analysis, 14th edn. Association of Official Analytical Chemists, et al. Analytical Chemists, Washington, DC, pp. 125–142.
3. ARC, 1984. The Nutrient Requirements of Ruminant Livestock, Supplement No. 1. Technical Review by an Agricultural Research Council Working Party. Commonwealth Agricultural Bureaux, Farnham Royal, Slough, England, 45 pp.
4. The use of 15N for determination of in sacco bacterial contamination of 3 concentrate feeds and N degradability of feeds in the rumen;Beckers;Ann. Zootech.,1993
5. Studies on the in situ nitrogen degradability corrected for bacterial contamination of concentrate feeds in steers;Beckers;J. Anim. Sci.,1995