In vitro digestibility of individual amino acids in rumen-undegraded protein: The modified three-step procedure and the immobilized digestive enzyme assay, S. E. Boucher, S. Calsamiglia, C. M. Parsons, M. D. Sterns, M. Ruiz Moreno, M. Vázquez-Añón, Charles G. Schwab
New Hampshire Agricultural Experiment Station Publications