I want to switch to organic feed or feed w/o animal by products. It seems noone around here carries it. Where does everyone get theirs? Do I need to mix my own? I hear the brain and CNS of pigs, cattle is all ground into the feed, and can cause serious disease (ie- mad cow disease) by feeding it to chickens, which can pass to humans by ingesting eggs/ meat that had been fed this food. Beside the antibiotics these pigs/ cattle had been given pass through into eggs/ meat.