Im still new with chickens . I have 9 from last spring that still do very well. All 7 of the layers still lay almost everyday as it varies but i usually have 4 to 7 every day. They didnt stop this winter. I would say they are healthy and large for their size. Im not sure what they are but i was told bantee but they looked mixed because they seem to be double the size of a bantee but smaller than regular size. My boyfriend who was a farm boy told me we should feed mostly corn. I used a blender to crack whole corn we grew and dried ourselves. I mixed this in the layer feed i bought probally half and half and then later got some mixed grain/bird feed from a friend that feeds it to all his animals. This is mixed with the corn and i break it up in blender and mix in with the feed. I also have no idea how much shells to add so i just mix some in. They free range when im home after work and when im home all day. They dont seem to eat much when running free. my eggs seem to be tasty and large and they seem fine. I read that corn was a nono all year but they love the corn and gobble it up fast. I dont feed them oatmeal much anymore but they love that and yogurt was inhaled. So are they not getting what they need and too much of corn?