The brand of feed we use has a starter ( 18%) and a grower ( 16%) then 18 and 16% layer feed. The grower says it is for 8wk to laying age. I only have 6 hens ( 4 wks old now) should I stay on the starter feed until they are laying or move to the grower when they are 8 wks. We got grower by mistake so we have an almost full ( 50lbs) of it, They are on starter right now. Will they eat 50lbs of feed by laying age?