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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.

Trace elements are important structural and functional components of the animal body. Although their content is low, they play a very important role in animal growth and development, metabolism, disease prevention, and improvement of feed utilization.