Our expert says:
Chickens may eat their own eggs if the egg is damaged (egg is a rich source of protein and vitamins that are now leaking out), but also due to excess disturbance (rather recycle the egg and lay another at a later stage than lose all those precious nutrients to a predator). Certain nutrient deficiencies, such as calcium deficiency, may also prompt them to start eating eggs. If they are not on it already, try feeding a commercial layer mix to rule out the last possibility, and try to disturb the nest as little as possible.
Dr Willemien van Wyk
Bird and exotic animal veterinarian
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