1. Akiba, J., H. Ohtani, S. Saitoh, H. Ohkawara, K. Takashi, M. Horiguchl, and K. Gotoh, 1988. L-Tryptophan improves egg production rate and alleviates fatty liver in laying hens. Pages 1034--1036 in: Proc. XVIII World's Poultry Congress, Nagoya, Japan, 7-15-14 Roppengi, Minato-kv, Tokyo, 106, Japan.
2. Studies with corn-soya laying diets. 8. Requirements for limiting amino acids--the basal diet and the requirements for isoleucine, lysine and tryptophan;Bray;Poultry Sci.,1969
3. The requirement for sulfur amino acid by laying hens as influenced by the protein concentration;Calderon;Poultry Sci.,1990
4. Fitting segmented polynomial regression models whose join points have to be estimated;Gallant;J. Am. Stat. Assoc.,1973
5. Studies on the lysine and tryptophan requirements of the laying and breeding hen;Ingram;Poultry Sci.,1951