Interesting thread.
I can remember my father when I was in my teens, urging me to go out into the field to glean corn for the chickens in the winter time and then for my horses once again in the winter. He was raised in the era where horses were used predominately for field work and although he was not an educated man, he had common sense knowledge and experience to fall back on. It helped them stay warm, he told me. I would never feed JUST corn to any animal, but I believe corn does have nutritional value for livestock when added in a small amount to feed.
A curious note. We feed our birds crumbles that we buy in 50 pound bags from the local MFA. They grind, blend and produce the food themselves and the layer feed has a whopping 20% of protein in it. The chickens love it. The other day I was looking at it closely and noted that there were small particles of ground corn in it. I'm sure that if corn didn't have nutritional value, it wouldn't be in that feed, especially since the feed boasts a protein level of 20%.
Chickens, like humans are omnivores. They will petty much eat anything that doesn't crawl away from them, although some chickens do have discriminating pallets when it comes to what they consider a meal or treat. Like humans they will eat stuff that isn't particularly healthy and nutritious but just plain tastes good to them...Put a bowl of M&Ms in front of me and they will not be around long. Same with our chickens. If I give them a bowl of cracked corn, they will gobble it down like it was M&Ms. Good for them? Probably not, but boy, does it taste good. So yes, I do add some cracked corn in with their layer feed. Not a lot, just a soft drink cup mixed in with 5 gallons of layer feed. It gives them something to scratch around for and when the small amount is gone I know that they will be having to eat their layer mix. The roosters are broad chested and the hens are beginning to lay eggs with strong hard shells. I also give them sunflower seeds sprinkled in the grass in their run as something to scratch around for.
I guess what I am saying is use common sense when you feed your birds. Treat them like children who don't necessarily know what is good for them over what tastes good.
And agree to disagree on this subject.