i was told you can buy regular 14% chicken mash, and add soy bean meal to bump up the protien and feed that to all birds, peas, chickens, turkeys, guineas. i was going to look into doing this too. id like to be at just around 20% protien. does anyone else do this, and what is the ratio of mash to soybean meal? id be working with a 50 pound bag of mash at a time, so how much of the soybean meal would i add to that to get 20% protien. i think he said the soybean meal was 48%, if im not mistaken. is this even a more cost effective way to feed?