They need protein. Check your feed sacks it tells the protein amount for good reason. If your giving them too much hen scratch that will do it too. Hen scratch is like candy for them. That's why they LOVE grasshoppers. High protein. Yummy. They also may need crushed oyster shells as well. This will make their eggs very hard. We got tired of messing with it so I built s monster size feeder. Holds around 300lbs of feed. We mix three bags of feed with one bag of scratch and one bag of oyster shells. No more problems at all. I also found that the food at tractor supply co. seems to make them happier too.
almost forgot throw some oyster shells out for them on the ground around the coupe too. you can even give them the leftover shells after your done with them. some people say that encourages them to eat their own eggs but I don't seem to have a problem. try the others fist and then try that. also you can call mcmurrayhatchery for tips too. they are very helpful. 1800-456-3280