If we put our babies outside in a penned up area for a few hours (covered mind you to keep the cats away and whatnot) and let them peck at whatevers in the 'brown' grass, do I need to feed them some super-fine grit as well to aid in the digestion? They currently are eating the starter food that we got when we bought them a week ago.. These are about 3 week old birds or perhaps 3.5 weeks for the two largers and about one week less for the two smallers.