Living organisms reflect a highly complex conglomeration of biological molecules, which are organized in an interactive network of biochemical events.The approaches of "systems biology (proteomics, glycomics, metabolomics, bioinformatics, etc.) now provide us with unprecedented opportunities to describe, in molecular terms, an organism under different physiological conditions and environment.The new biochemical profiling approaches based on capillary chromatography, electrophoresis, and biomolecular mass spectrometry can now be utilized for a better understanding of biochemical variations in different animal species due to a genetic make-up or mutations, physiological status, disease vs.health, or nutritional modifications.