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and yet one has to wonder why chickens eat so much grass if given a choice. there are almost no calories, very little proteins, no fat. I conclude, and perhaps I am wrong, that they are after unspecified micronutrients.Carotenes in fresh greens will make yolks darker orange since chickens don't synthesize them and they end up coloring the yolk.
Chickens, like most animals have the genetic makeup to synthesize enough vitamin C for their needs so they don't need any in the diet. Chickens under stress, like extreme heat can benefit from vitamin C in the diet but don't need it like humans do.
Methionine is vitally important and not only needed for growth but is indicated for feathering and performance in poultry. It is the primary limiting amino acid in all ages of poultry. It is also essential in immune cell production, egg production and maintaining body weight. Diets deficient in methionine will induce feather eating and can turn to cannibalism.
True, it is unlikely they're switched off but I imagine that they can be provided seasonally in sufficient quantities.
Jungle fowl range from the tropics of SE Asia to the Himalayan foothills. Winter in the Himalayas won't provide many greens either.
Trees growing at 15,000' doesn't make the environment tropical.CC, it is really tropical out there. In Nepal, trees go up to well above 15,000 feet, our tree lines in the rockies are half that.