Expansion-Extrusion Processing of Corn, Milo and Raw Soybeans Before and After Incorporation in Broiler Diets

PROCESSING of cereal grains by various methods such as steam rolling or flaking has generally been demonstrated to be effective in increasing the efficiency of feed utilization for beef cattle (Totusek and White, 1968). Limited work appears to have been conducted with poultry. Recently, however, there has been an increased interest in the effects of processing on the utilization of cereal grains and starches (Adams and Naber, 1969; Moran et al., 1969; Naber and Touchbum, 1969a, b; Saunders et al., 1969). Expansion-extrusion processing, which combines short-time-high-temperature cooking under steam and pressure, has been demonstrated to be effective for processing full-fat soybeans for broiler and layer diets (White et al., 1967; Hull et al., 1969; Waldroup et al., 1969). Since this method of processing results in cell rupture and gelatinization of the starch granules (Mustakas et al., 1964; Smith, 1967; de Muelenaere and Buzzard, 1969) it is quite possible that improved…