Introduction.- Anatomical characteristics of the gastrointestinal tract and digestive glands of pigs during development.- Development of the gastrointestinal tract in pigs.- Development of the digestive glands in pigs.- Development and renewal of the intestinal villi in pigs.- Terminal digestion, amino acid absorption/metabolism and microbiota in the pig intestine during development.- Terminal digestion of polypeptides and amino acid absorption by the pig intestine epithelial cells during development.- Developmental amino acid metabolism in the pig small and large intestine epithelial cells.- Development of the micro-ecological system in small and large intestine of piglets.- Physiological functions of amino acids in pigs.- Structure and functions of amino acids: an overview.- Synthesis and degradation of proteins in pigs.- Factors that affect amino acid metabolism in pigs.- Amino acids and hormone secretion in pigs.- Amino acids, gene expression and cell signaling in the pig intestine.- Amino acids and immune functions.- Amino acids and obesity, diabetes and dyslipidemia.- Methodology for research on amino acid.- Methods for amino acid analysis.- Surgical techniques used for research in amino acid nutrition.- Measurement of protein digestibility in pigs.- Measurement of synthesis and degradation of proteins.- Methods for measuring amino acids of endogenous origin in pig intestines.