Vitamin D3, also known as cholecalciferol, is one of the main forms of vitamin D. It has an important effect on calcium and phosphorus metabolism and bone growth in young animals. Its main function is to promote the normal absorption of calcium and phosphorus in the small intestine.

The basic function of vitamin D3 is to participate in the metabolism of calcium and phosphorus in the body, promote the absorption of calcium and phosphorus in the intestine, adjust the ratio of calcium and phosphorus absorption, and promote bone calcification and normal development. It is necessary for the formation of normal bones, beaks, claws and eggshells.In addition, it also has the function of promoting the reproduction and differentiation of immune cells and improving the body's immune function.
Lack of vitamin D3, even if calcium and phosphorus are sufficient, they cannot be deposited well in the bones. Young animals and poultry are prone to rickets and rickets, poor tooth development, and growth retardation;
Lack of vitamin D3, adult animals develop osteoporosis, hens are prone to soft-shelled eggs, thin-shelled eggs, excessive vitamin D deficiency in females during pregnancy can cause birth defects in newborns, and the bones of the females themselves are also damaged.