I remember feeding mines at 17 weeks old. They never had any kidney problems or any side-effects, and now they are 1 year & 2 months old. But right now you can just feed them oyster shells or crushed egg shells because they both have a lot of calcium to help build up the shells in your chicken's...
Hello, and congrats on your first egg! Is that the first egg she laid? (the one with the soft shells)? If so, then it's completely normal for starter layers to lay odd types of eggs such as soft shells, small eggs, or even double yolks. I would start feeding them layer crumbles that contains...