Hi, New to raising egg layers, (chickens in general) been looking through past threads trying to find a good mix of feed, corn, and grit or oyster shell. We have a mixed flock of about a dozen layers, some laying some not quite yet. I m adding corn in because we aren't getting dark yellow yolk in most eggs, and i also thought the corn was supposed to help "fatten em up" in the colder months, We live in Iowa btw. SO I guees my question is should I keep mixing layer feed, corn, and oyster shells and dumping into the feeder together, or should I be seperating them. Thanks for any advice!