I have some year and a half old laying hens and I just recently got some 10 week old pullets who are just dying to mix in with the flock. They are separated now but I was planning on introducing them soon. I keep reading that feeding layer feed to chickens too young to lay will cause them health problems. What should I feed them when they are together then? What do people who let their hens hatch out chicks and raise them in the flock feed?