I buy scratch, maintenance pellets or crumbles, laying pellets or crumbles and rolled oats. I mix according to time of year. But, I never mix a ratio of more than 1/4 scratch.....the corn in scratch creates extra body heat in the birds(if they get cold in winter, they will pick the corn out theirself if they need it) Corn also over time will give a white bird a brassy scheen(not desirable) Pellets and crumbles are easy for birds to break down and most have the needed nutrients in them.