Processing grains with a roller mill may produce a product similar to grinding but results in a more uniform final product. Roller mills are generally more expensive than hammer mills but cost less to operate. Rolling is the best processing for wheat and oats under most situations. Rolled oats are desirable in some baby pig diets. Roasting And Extruding Roasting and extruding are used primarily to process soybeans.
Raw soybeans contain toxic compounds that reduce pig performance.
Soybeans must be heated to destroy these compounds. The ideal cooking time and temperature depends on the equipment and moisture content of the soybeans. Roasters use an external source of heat, usually gas. Extruders use heat generated by the soybean kernel. Extruders subject soybeans to extremely high pressure, creating heat.