Burgoon et al., 1992. J. Anim. Sci., 70 (8): 2493-2500 Document reference Burgoon, K. G. ; Knabe, D. A. ; Gregg, E. J., 1992. Digestible tryptophan requirements of starting, growing and finishing pigs. J. Anim. Sci., 70 (8): 2493-2500Web https://doi.org/10.2527/1992.7082493xCitation key Burgoon et al., 1992
