The definition of vitamin and its role in animal feed Vitamins are a group of low-molecular organic compounds with different chemical structures, different nutritional and physiological functions. The content of vitamins in animal diets is about five ten thousandths, which is much less than other nutrients. Vitamins are neither a source of energy nor a structural substance of body tissues and organs, but they are indispensable to the normal life activities of animals. A small amount of vitamins can maintain the body's normal metabolism, growth and development, reproduction, resistance to diseases and normal survive. The main function of vitamins is to participate in the formation of highly active enzymes in animals. It has been proved that many kinds of enzymes contain vitamins. For example, vitamin B1 is a coenzyme of oxidative carboxylase, which participates in the sugar metabolism pyruvate decarboxylation reaction; vitamin B2 is a component of the prosthetic group of yellow enzymes and participates in biological oxidation in the body. If one of these vitamins is lacking, the body's corresponding metabolism will undergo abnormal changes. Most vitamins cannot be synthesized in animals, and only a few can be synthesized by animals themselves (microbes that are parasitic in the rumen of ruminants can synthesize multiple vitamins), but some vitamins are synthesized in very small amounts and cannot meet the normal needs of animals. It can be obtained from feed to ensure its normal growth, development and reproduction. 　　 It has been ascertained that 13 kinds of vitamins are needed in the diet of animals. Lack of any of them will cause abnormalities in the animals, such as growth retardation, decreased productivity, weakened disease resistance, and even death. Vitamin deficiency often has syndromes, and it is not easy to quickly determine which vitamin is lacking. Therefore, it is necessary to add sufficient amounts of various vitamins to the animal diet according to the standard to eliminate various unfavorable factors that destroy vitamins and avoid vitamin deficiency. .

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