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Mammary gland secretion is the first source of nutrients for the newborn calf. Liquid feeds constitute an essential part of daily ration during the first weeks of life. Whole milk is commonly substituted by commercial milk replacers. Young calves should receive properly balanced rations. They need a large amount of amino acids, which are required for protein synthesis. Not only dietary protein content, but also its digestibility and amino acid composition, have a great impact on performance and metabolism of fast growing calves. The aim of this paper was to present the aspects connected with amino acids in calves rearing. [ABSTRACT FROM AUTHOR]