It is difficult to formulate organic poultry diets using only plant materials, while avoiding excessively high total protein levels. Krimpen et al. [18] formulated organic layer diets incorporating expelled soybean meal, expelled rapeseed, and de-hulled sunflower seeds, which resulted in 20% CP. However, as noted by the authors, this level of protein was higher than what is needed by layers. Adding potato protein and corn gluten meal (95% organic diet) to supply methionine allowed the protein level to be reduced to 18%. However, the commercial availability of organic potato protein and corn gluten meal is low.