I am new to this so I am hoping to buy chickens on laying age or close and trying to figure out what feed is best. In the basics section of Backyard chickens, I read about grower ration, layer ration, starter-grower and layer. Just what am I supposed to use? I seem to gravatate to layer ration, but see several varieties at the feed store (Cal Ranch). Can someone help me wade through all this and tell me what is best?