Final thought. While I am not a poultry (or any other animal) feed expert, a veterinarian, or any other qualified thing, I have done a lot of reading on the subject of late.
Oats are very high in beta-glucans, which have the habit of contributing to sticky poops. Particularly in freezing winter conditions, that's something you want to try and avoid, more so if any of your birds ore of the feather footed varieties (i.e. Brahmas). Oats, or any other treat, should not exceed 10% of the bird's daily ration, by weight. This is a case where corn might actually be a better choice, though it pains me to say it. Wheat better still. Best practice remains offering a nutritionally complete feed without adjuncts like additional corn, oats, rye, wheat, etc - more so if you offer a low protein feed (16% or lower) such as the typical "layer" ration.
Mixing complete feed with cool or cold water in the summer, or heated water in the winter, to make an oatmeal-like consistency is an activity many of us engage in to help reduce temperature stresses with our birds. Its called a "wet mash". If you cover the feed with water and allow a few days, you will have "fermented feed".