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Continue to ChatSprinkling coarse marble powder during the afternoon, toward the end of the laying period, may increase eggshell quality - https://avesis.omu.edu.tr/yayin/f03c6043-5f21-4953-9493-aa7f3328ba67/sprinkling-coarse-marble-powder-during-the-afternoon-toward-the-end-of-the-laying-period-may-increase-eggshell-quality