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Biogenic amines are low molecular weight organic bases present in all organisms. The most common are putrescine, cadaverine, spermine, spermidine, histamine, tryptamine and β- phenylethylamine. In low concentrations they are essential for the normal growth and differentiation of cells (Bardócz et al., 1995), but in larger quantities are harmful to humans and livestock. Biogenic amines are naturally present in silage; however their presence in high concentrations may be a sign of undesirable changes in the fermented forage and has been linked to low feed intake in ruminants (Van Os et al., 1996; 1997)...