1. AOAC, 2005. Official Methods of Analysis. 18th revised edition. Association of Official Analytical Chemists International, Gaithersburg, MD, USA
2. Cabrita, A.R.J., Maia, M.R.G., Freitas, M., Abreu, J.M.F., Fonseca, A.J.M., 2011. Colour score as a guide for estimating the protein value of corn gluten feed. Journal of the Science of Food and Agriculture, 91, 1648–1652
3. Deif, H.I., El-Shazly, K., Abou Akkada, A.R., 1968. Biological value of urea, casein and gluten in the diets of sheep. British Journal of Nutrition, 2, 451–460
4. Eisler, M.C., Lee, M.R.F., Tarlton, J.F., Martin, G.B., Beddington, J., Dungait, J.A.J., Greathead, H., Liu, J., Mathew, S., Miller, H., Misselbrook, T., Murray, P., Vinod, V.K., Van Saun, R., Winter, M., 2014. Agriculture: steps to sustainable livestock. Nature, 507, 32–34
5. Gami, R., Thakur, S.S., Mahesh, M.S., 2015. Protein sparing effect of dietary rumen protected lysine plus methionine in growing Murrah buffaloes (Bubalus bubalis). Proceedings of the National Academy of Sciences, India, Section B: Biological Sciences, DOI 10.1007/s40011-015-0662-2 (in press)