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Beta Carotene is a precursor to vitamin A. Chickens store it in one of the skin layers and it gives the skin a yellow color. Laying hens will draw upon the stored reserves of Beta Carotene and deposit it into the egg yolks. Over time, as those reserves are depleted, the skin fades from yellow to white or pinkish in color. The rate of depletion is dependant upon the amount of Beta Carotene in the diet. So the question is - are you talking about laying hens when you say the leg color has changed from yellow to pink? If you are and they have been laying heavily for some time, this could explain what you are seeing.
Beta Carotene is a precursor to vitamin A. Chickens store it in one of the skin layers and it gives the skin a yellow color. Laying hens will draw upon the stored reserves of Beta Carotene and deposit it into the egg yolks. Over time, as those reserves are depleted, the skin fades from yellow to white or pinkish in color. The rate of depletion is dependant upon the amount of Beta Carotene in the diet. So the question is - are you talking about laying hens when you say the leg color has changed from yellow to pink? If you are and they have been laying heavily for some time, this could explain what you are seeing.