starch by a lysine-producing bacterium (Wittmann and
Becker, 2007). Lysine is then purified from the fermentation
broth by ion exchange (Hermann, 2003), mixed
with HCl, and sold as L-Lys∙HCl. The fermentation
biomass that is left after extraction of Lys is dried and
a product called dried fermentation biomass (DFB) is
produced. Dried fermentation biomass might have value
as a potential feed ingredient for weanling pigs, but
at this point, no data have been reported on the feeding
value of this ingredient.