Soybeans and other beans are roasted prior to joining the rest of the ingredients in the mill. During the milling process, most of the ingredients are heat treated either by cooking or micronization using infra-red radiation. That reduces the anti-nutritional factors and non-starch polysaccharides (NSP).I had read that peas didn't have to be cooked. When they are included in a chicken feed, how are they cooked? I think Scratch and Peck and New Country Organics both have peas in their mixes.
Relative to beans, peas do have lower levels of soluble NSP but peas still contain trypsin inhibitors which interfere with digestion and have an anti nutritional effect. The heat treatment is also beneficial in reducing the fungi naturally found in grains limiting the potential for molding in the resulting feed.