Oyster powder contains more calcium than shell powder, but also contains the necessary trace elements in livestock and poultry: phosphorus, manganese, zinc, copper, iron, potassium, magnesium and so on. In addition, there are many elements in the pearl layer of the shell. In addition, it contains 90-95% calcium carbonate, 1.83% crude protein and 0.07% crude fat. Therefore, using shell powder as feed additive can not only promote bone growth, blood circulation of livestock and poultry, but also increase the output of eggs and milk and improve its quality. Powder can significantly improve the quality of eggshell and improve the laying rate.