According to the data, the skin, veins and nucleus of citrus are rich in crude protein, crude fat and cellulose, and also contain trace elements such as iron, manganese and zinc, which can be used as feed additives for livestock and poultry. The skin, veins, and nucleus of the citrus are sun dried, ground into powder, and fed into the feed by a certain amount of feed. According to the study, 1% to 2% of citrus peel powder is added to the duck feed, 2% to 3% of the added chicken feed, 5% to 10% of the added pig feed, and 10% to 20% of the cattle feed are added to feed the livestock and poultry. Have achieved good results. Vitamins are a type of trace organic substances that humans and animals must obtain from food in order to maintain normal physiological functions. In terms of physiological functions, vitamins are neither a raw material for tissues nor a substance for supplying energy, but they are an indispensable substance for the body. It has many types and different chemical structures. Most of them are the components of the coenzyme (or prosthetic group) of certain enzymes. They are the indispensable compounds for maintaining the normal growth (growth, health, reproduction and production function) of the body. It plays a catalytic role in the body to promote the synthesis and degradation of major nutrients (proteins, fats, carbohydrates, etc.), thereby controlling metabolism. Vitamins are essentially low-molecular organic compounds. They cannot be synthesized in the body, or the amount synthesized is difficult to meet the needs of the body, so they must be supplied from the outside. The daily requirement of vitamins is very small (usually measured in milligrams or micrograms). They are neither a raw material for body tissues nor a substance for energy supply in the body. However, they do not regulate material metabolism, promote growth and development, and maintain physiological functions. Vitamin K2 MK-7, Vitamin C, Vitamin E, Vitamin K2, Vitamin H, Vitamin D3 Xi'an Gawen Biotechnology Co., Ltd , https://www.ahualyn-bios.com