Abstract
This chapter discusses various concepts of mechanisms of absorption of amino acids and peptides and their subsequent transport through the intestinal wall. There have been advances in the knowledge of amino acid needs of animals and this seems notably true for ruminants. Following a report in 1949 that stated that essential amino acids were synthesized in the rumen, the major research focus was on nitrogen supply in the diet, especially nonprotein nitrogen (NPN) with minimal regard for protein quality (amino acid supply). In recent years, much effort has been put into quantifying protein escaping ruminal degradation and also into finding ways to manipulate the protein reaching the small intestine. The aim of such research has been to unravel the physiological phenomena associated with amino acid absorption from the small intestine. The understanding of peptide and amino acid absorption will be materially enhanced with the application of new technologies.
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