I got several hundred lbs of free cracked corn. To utilize this as a standard feed, I will need to add stuff. The local feed mill will sell me soy meal (47% protein) for about $19.50/lbs. I figure to add 300lbs of cracked corn to bring the protein level to 17% for my layers, and a little less to get 20% for my meaties. But I've never mixed feed before. Anything else I need to mix in? I already feed their eggshells back to them. They get table scraps and free range for at least a couple hours each day (often all day).