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IFA Oyster Shell Layer Blend poultry supplement provides your hens the extra calcium they need to build strong eggshells without compromising bone health. Building eggs requires a lot of calcium to make the shell hard and strong. This pellet-sized treat gives your laying hens the extra minerals they need to grow strong eggshells and maintain strong bones. Made from 100% heat-treated oyster shell, IFA's Oyster Shell calcium supplement is an important part of your laying hens' daily nutrition to ensure they get enough calcium to stay health.