Vitamin B deficiency is a general term for many diseases caused by vitamin B deficiency. B vitamins include vitamin B 1, vitamin B2, vitamin B3, vitamin B6, vitamin B7, vitamin B 12 and vitamin PP, etc. These substances are mainly used as coenzymes of cell enzymes in vivo to catalyze various reactions in substance metabolism, but they are different in chemical structure and physiological function. Vitamin B has a wide range of sources, with the highest content in turquoise feed, yeast, bran, rice bran and germinated seeds. Only corn lacks nicotinic acid, but B vitamins are easily lost from water and can hardly be stored in the body. Therefore, short-term deficiency or insufficiency is enough to reduce the activity of some enzymes in the body, inhibit the corresponding metabolic process, and affect the health of animals.