The Nutritive Value of Distillers’ By-Products

ALTHOUGH distillers’ by-products have long been used as animal feeds, very little data have been reported on their nutritive value. After alcohol has been distilled from the fermented mash in the manufacture of whisky or of alcohol from grain the residue contains all of the protein, fat, fiber, and mineral matter practically unchanged. Part of this material is in solution in the liquid portion but the larger part is in the form of suspended material that can be recovered by filtering. This unfiltered material is known as thick slop. The suspended material is filtered out and dried and is known as distillers’ grains. The liquid which passes through the filter is known as slop. The slop may be concentrated under vacuum to a thick syrup and is referred to in this paper as concentrated slop. Present day methods of producing distillery by-products are described in detail by Cooley (1938). This . . .