Hello, My girls will be 18 weeks soon and I was going to move them to a laying ration soon. However, we will be gettin chicks in the spring and once they are old enough they will join the older ladies. I've read that the growing feed is not good for the older hens and the laying ration has too much calcium for chicks/pullets. Is there a feed I can use for growing, egg laying and roosters and then offer oyster shell free choice? Not sure if there is a simple solution or if I would need to keep them separate until they are on a laying ration. Thanks so much!