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yeah... i mean, it's a question of calories, really, not corn specifically. it just so happens that corn is absolutely busting with calories. that's especially important for a bird, as they have higher metabolic rates than mammals.
To say that it's the calories is too simple an explanation. Those calories come from fats, protein and carbohydrates that must be metabolized to energy. They are not equal in heat increment. The heat increment with protein is the highest, followed by carbs, and then fats. High calories does not translate to a higher heat increment. Oats have a higher heating increment due to higher fiber and protein content than corn while they are lower in calories per pound than corn...
I have wondered about this with my birds. 36 years ago I took a ruminant nutrition class in grad school. We learned about the heat increment value of various feedstuffs. The students all expected a higher concentrate diet would keep the animals warmer in winter. Not so. Digestion of fiber produces more heat than digestion of the starch in corn, for example. If this applies to birds also, then it makes sense to feed whole oats rather than corn as a scratch grain in northern winters.