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Betaine as a methyl donor can partially replace choline; choline and betaine can partially replace methionine. However, its substitution effect should be comprehensively considered according to the composition of the diet, the specific nutritional needs of the animals, and the price.

The organic trace elements commonly used in piglets are copper (Cu), iron (Fe), zinc (Zn), manganese (Mn), and selenium (Se), and their distribution in pigs is different. Although pigs require a small amount of them, their role is very important. They are involved in nutritional metabolism processes such as protein, amino acids, nucleic acids, carbohydrates and vitamins, and are also necessary for physiological functions such as reproduction, immunity, growth and development.

Vitamins are one of the important factors affecting the reproductive function of pigs, and pig diets need to contain a certain amount of various vitamins. They promote the synthesis and degradation of major nutrients, thereby controlling the body's metabolism. Vitamin deficiency will affect the synthesis of coenzymes, lead to metabolic disorders, various diseases in animals, and also affect the reproductive function of animals.

Food preservatives are a type of food additives that prevent food spoilage due to the action of microorganisms and prolong the shelf life of food. Its anti-corrosion mechanism is mainly to reduce the water activity of the product, reduce the PH of the product, act on the specific structural parts of the microorganism, destroy the growth of the microorganism or the normal progress of the metabolic system, thereby inhibiting the growth of the microorganism and prolonging the shelf life of the product.