Soybeans are the most widely grown oilseed in the world. In animal rations, dry extruded soybeans consistently produce higher daily weight gains with less feed, as compared to other types of soybean processing. The oil has a very pleasant color, aroma and taste. Dry extrusion releases tocopherols, the natural anti-oxidants contained in soybeans.
Tocopherols also keep dry extruded soybean meal from going rancid for a period of months.
Steam Preconditioners double production capacity of the extruders and reduce mechanical wear. Cottonseed contains a toxic pigment called gossypol, which can be reduced through the use of dry extrusion. The latter are hydrolyzed into toxic compounds when the seed is broken, which causes metabolic problems in pigs and poultry. Dry extrusion prevents hydrolysis of glucosinolates. Alternatively, rapeseed can be extruded in combination with a low-oil legume, such a field beans or peas, which also need heat processing.