Process for the protection of amino acids against ruminal degradation and feed complex for ruminants, obtained by this process

摘要

The process consists in complexing one or more free amino acids with a reducing sugar by means of a hydrothermal treatment carried out by cooking-extrusion with a feed substrate, which treatment leads to the condensation of an amino acid molecule and of a sugar molecule. The conditions of the treatment are adapted in order to make possible the initiation of a Maillard reaction between the two constituents and in order to limit this reaction to the early stages. The amino acids capable of being used can be lysine or methionine (lysine hydrochloride and DL-methionine respectively); the feed substrate can be lupin flour and the reducing sugar results from lactoserum (whey) powder. Such a process can be used for protecting synthetic amino acids with respect to ruminal degradation in dairy cows, for the purpose of increasing the proteinic (protein) level in milk especially.