1. Balancing swine rations;Becker;Illinois Agr. Exp. Sta. Cir.,1966
2. Amino Acid Handbook,;Block,1956
3. Boomgaardt, J., 1972. Factors influencing the amino acid requirements of poultry and swine. Ph.D. Thesis, University of Illinois, Urbana.
4. The lysine requirement of the chick at five protein levels;Boomgaardt;Poultry Sci.,1970
5. Tryptophan requirement of growing chicks as affected by dietary protein level;Boomgaardt;J. Anim. Sci.,1971