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The idea that corn warms birds I don't believe comes from digestion producing energy, I've never heard it explained that way.
Every time I've thought or heard of corn keeping birds warm, it has always been how
fat corn makes them. Corn is carbohydrates, if they don't use it, it just turns to fat. Fat will make anything/anyone hot, ask any obese person and they'll be burning up in a room while people who are their correct weight will be fine.
How well it helps I'm not sure, but I know in the summer birds with a little extra weight will appear to be burning up versus birds that are in shape.
ETA:I do agree that it is not nutritionally complete, but if it is supplementing a free range diet perhaps it's alright.
Not really. Basically what happens is the simpler the sugar the more it either burns up or gets passed through the kidneys. The more complex the suger/carbohydrate the less heat it produces while being digested and the easier it turns to fat.
Corn sugar burns almost completely in the digestive process and produces heat. Any excess not burned up (if the bird is extremely lazy for example) gets passed through the kidneys. With all warm blooded mammals it is the complex carbs that makes you fat..not the simple sugar. Have you ever heard if you are on a diet and have a sweet craving, suck on a piece of hard candy. This is because it is simple sugar and what does not burn up gets urinated away. If you eat a piece of cake you are eating complex sugars and that will turn to fat.
Maybe I am wrong, I haven't read very many books. But I know from personal experience and watching old timers if they ever wanted to put weight on a bird they added whole corn. I've picked birds up that were on a pellet diet and most of the time they feel a little under weight to me, give them whole corn and in a month or so they'll either be in perfect shape or fat depending on how much they got.
I can only speak from personal experience on that, I have no books to quote. I may research it later myself.
ETA: And yes, I've been around chickens long enough I know what the difference in a underweight bird, fat bird, and a bird in perfect shape feels like.
God bless,
Daniel.