I know this question has been asked before (probably a few times) and I think I know the answer, but can not seem to find post about it. I only have about one week of grower left to feed 20-22 week old pullets. I do have layer on hand. Would it be fine to switch over to layer at this age before they have laid any eggs? If I remember correctly, I have read here before that layer should NOT be started before they lay their first egg because of the high calcium and low protein content. I just do not want to buy another 50lb bag if not necessary. I only have six birds, so 50 lbs goes a long way.