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− The aim of the research was to study, considering the modern requirements of amino acid, composition and biological value of milk proteins of Holstein cows, imported from the Netherlands, during the adaptation period in the agricultural holding "EkoNivaAgro" (Voronezh region) with the level of milk yield in the herd of 8700 kg, a mass fraction of 3.8% of fat and 3.35% of protein. As a result, a high concentration and a complete set of essential and non-essential amino acids of milk proteins were revealed, which indicates their biological value. Among the essential amino acids, there is the greatest number of phenylalanine + tyrosine (PHE + TYR), lysine (LYS), leucine (LEU), Val. The content of tryptophan was insignificant. The sum of the essential amino acids exceeded their amount in the ideal protein. However, the amino acid number varied in a rather wide range: from 60.6 % in tryptophan (TRP) to 197% in the amino acids phenylalanine + tyrosine (PHE + TYR), which shows their imbalance. The limiting amino acid is tryptophan, which determines the level of use of other essential amino acids of milk. As a result, with high natural digestibility of milk proteins (96%), the human body will use only 59% of incoming essential amino

Amino acid Composition and Biological Value of milk of Galshinsky-Breed Cows During Adaptation