From the things I've read, chickens are first fed starter, then grower, then layer feeds. Some places suggest feeding only layer feed, (when the age of the bird is appropriate) and not feeding grower feed at all. I'm confused. I've also looked around town for grower feed but all I can seem to find is layer feed. I have Columbian Wyandottes, Barred Rock and Easter Eggers. Can someone clear this up for me please?