Im pretty new to raising chickens. I have 10 BO's that are 21 weeks. 7 of them look great with good sized bright red combs/waddles and are a good size. 3 of them have smaller combs that are more pale. At least two of my hens have started laying eggs. I was reading that to lay eggs they need more calcium so I have started mixing in layered feed into the grower feed. However I also read that if they arent mature enough it can cause kidney problems. Im torn on whether to give them the layered feed or wait until the less mature hens catch up? I have no way to seperate them so would love some advice. Also when should I give them oyster shells to help with the egg laying. Btw, its been unseasonably hot and the less mature hens are also lower on the pecking order which is why Im assuming they are behind. Probably not eating as much even though the feed is always out there and plentiful.
Any thoughts on all that?