Sort of a dumb question, I guess, but here goes- I want to feed my chickens oats as a treat this summer, because I've read that oats won't jack up their body temp. So, do I go to the feed store for whole, raw oats? Or can I feed something like Quaker Old-Fashioned Oats (the kind you cook before serving). I'm guessing instant oatmeal isn't what I want? If the stuff is dry, pre-packaged oatmeal, would it expand & do them harm after they eat it? Thanks for your advice!