My girls will be 16 weeks old on Weds. I have been feeding them Nutrena grower from the beginning. I am beginning to question my feed stores advice. I called the store 2 days after i brought my chicks home they said the grower is fine, that I did noit need chick starter. Now they are telling me to continue to the grower feed until after my chicks lay and then keep them on the same feed just offer oyster to them. I also did not realize that this feed is medicated. It does not say this on the bag but they did tell me today. The reason we got the chicks was to have healthier eggs and to eat more organically. i am a hospice RN and feel there is a huge relationship between chemicals we are exposed to and our health. What should I feed my girls? They do free range about 6 hours a day in my backyard and their treats are organic yogurt and produce.