Iodine is a component of thyroxine, a hormone adjusts metabolism in animal bodies. When the level of iodine is low in animal bodies, animals will be affected by struma and so normal grow and reproduction of animals will be interfered. Specifications: 1) Ca(IO3)2 I: ≥61.8 2) Calcium iodate thinner I: 1.0±0.05 Pb≤0.001, As≤0.0005 3) Calcium iodate thinner I: 5.0±0.10 Pb≤0.004, As≤0.0005