You didn't say what you are feeding your chickens on a daily basis, if the oyster shell is always available or how old your chickens are. Thin egg shells can be a sign of old age in hens, if they are being fed a balanced diet and always have access to a calcium supplement, like oyster shell. A good layer feed should have a good amount of calcium. It's good that you are trying to give more calcium with oyster shell. Other nutrients may be necessary to help your hens process enough calcium. Not knowing the breed of hens and how old they are makes it difficult to give you an answer precise to your flock. "Production" breeds can only lay well for a couple of years. https://www.raising-chickens.org/egg-laying.html
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