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Amino acids are organic molecules which form the building blocks of proteins, which together with fat, carbohydrates, vitamins, trace elements, minerals and water are the basic components of food and feed.
About 20 different amino acids are involved in building body protein. Some cannot be formed in the body and must be added in appropriate quantities to the feed. They are therefore called essential amino acids. If any of the essential amino acids is missing, protein synthesis stops. The first amino acid which interrupts protein synthesis in this way is called the first limiting amino acid.
Methionine is the first limiting amino acid for poultry. If the natural methionine content of a poultry feed is low, it must be augmented with supplements.
Lysine is the first limiting amino acid for pigs. If the natural lysine content of a pig feed is low, it must be augmented with supplements.