A.S. Series 69-26
Studies conducted over a four-year period with low protein diets for caged layers are summarized in Table 1. The data indicate that the 9.4 percent protein diet with added methionine, lysine and tryptophan would support a rate of egg production nearly the same as a 15.4 percent protein diet. The rate of production from a 12.4 percent protein diet was not improved by raising the protein level to 15.4 percent. Further addition of protein after the amino acid deficiency has been corrected should only cause an increase in loss of nitrogen in the excreta.
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Department of Animal Science, Agricultural Experiment Station, South Dakota State University
Novacek, E. J., "Amino Acids and Layers" (1969). South Dakota Poultry Field Day Proceedings and Research Reports, 1969. 6.