I have read both that I should keep the pullets on starter feed until moving them on to layer feed at about 18 or so weeks, once they start laying. I have also read that they should be moved to a grower feed at 4 weeks. I am considering ordering a 50 lb bag of organic food from New Country Organics and am not sure which I should order? I do have about half of a large bag of chick feed from the local feed store (Purina non medicated) that I need to finish up but at the rate they are kicking it around it wont take to long. Ugh.....