My neighbor just gave me 50 lb of oats for my chickns from a crop he grew just down the road from my house. (This came when I gave him a dozen eggs to endear him to my hens and my crowing rooster ---clearly it worked ). I give my chickens scratch, a handful or so a day to give them something to do in the run. Any problem substituting the oats for the Purina scratch? Or is there a better way to use them?