Help! I have 22 week old chickens (RIR, Buffs, EE), none are laying. I am finishing up bag of food. I’ve read if they are not laying and get fed layer food, it can damage kidneys. (Also what if a few are laying and the rest are not?) I am willing to mix my own but just read changing them over from what they are used to (crumbles to my own mixed whole grain) can be detrimental. I can offer oyster shells but have not yet. I am concerned they need more protein. I don’t know what to buy...