Oyster Shell is a feed grade calcium carbonate for layers, breeders, turkeys, chicks, swine and cattle. An excellent source of Calcium and stays in suspension throughout the feed line making calcium available many hours after feeding to help protect the medullary bone and provide stronger bones. Calcium Shell can be used as an additional source of calcium for laying hens as well as a digestible source of grit. This product should be provided free choice to allow hens to self-regulate their intake to best suit their individual needs. Oyster shell can also be used as a calcium source in gardening and a soil amendment to prevent compaction and improve drainage. Oyster Shell's high calcium content helps balance soil pH, prevent calcium deficiencies, improve nitrogen uptake, and more! The shell can also repel voles, snails, and slugs if applied appropriately.