I have 3 week old pullets and am wondering when to switch from starter to grower. They are growing rapidly and have gone more than half way through a 50 lb bag of starter. I was planning on keeping them on the starter until they finished it all but I will be getting some more chicks around the 13th so thought I would switch them if it would be better for them and save the rest of the starter for the newbies. It really doesn't matter to me because either way I need to go to the feed store. Just wondering what's better for them at this age.