1. Nutrient Requirements of Poultry;National Research Council,1994
2. Nutrient Requirements of Poultry;National Research Council,1984
3. Protein and sulfur amino acid nutrition of the hen during the early stage of laying;Schutte;Arch. Geflügelkd.,1984
4. The requirement for sulfur amino acid by laying hens as influenced by the protein concentration;Calderon;Poult. Sci.,1990
5. The methionine requirement of laying hens as affected by dietary protein levels;Cao;Poult. Sci.,1992