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Personally, I wouldn't. Oats are nutritionally deficient compared with layer rations. If it gets very cold where you are, your birds need enough calories to keep themselves warm. If you scrimp on their diet, they may lose weight and come out of the winter in poor condition which could result in fewer eggs for you when they resume laying in the spring.
I have noticed that my flock consumes quite a bit less of their layer feed during the winter, anyway. When they're not pumping out the eggs, they just don't need to gobble the food.