Abstract
To obtain high efficiency from animals, it is necessary to maximize the ability to benefit from feed, as well as to protect animal health. One of the important applications in this direction is feed additives. Feed additives are plant and animal products and microorganisms that increase fish production and welfare, improve digestion and digestive system microflora and contribute to the preservation of nutrients and feed. Although plant and animal tissues are used in enzyme production, the use of microorganisms is in the first place. After the use of molecular genetic techniques, the genes responsible for enzyme production were cloned in microorganisms, making it possible to produce enzymes more purely and cheaply on an industrial scale.
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