I have been raising Delawares for a couple of years now. I have always followed the standard schedule for switching to grower feed without any problems, but I read recently that the LF heritage breeds should be raised on a higher protein feed. My Delawares have not filled out as well as I have liked in the past, and I've always attributed it to genetics, but now I am starting to wonder. When do you switch the large breeds over to grower feed?