title: Effect of ingredients and processing parameters on pellet quality.
abstract: Rations containing varying ratios of corn, high-oil corn, soybean meal, and mechanically expelled soybean meal were pelleted. The effects of ingredients, conditioning steam pressure, and mixing paddle configuration inside the conditioner on pellet quality were investigated. Ration ingredients strongly affected pellet quality. Increasing the protein content increased the pellet durability, whereas increasing the oil content above 7.5% greatly decreased pellet durability. High-oil corn and mechanically expelled soybean meal produced acceptable pellets when combined with soybean meal and regular corn, respectively. However, poor pellet quality resulted when rations containing high-oil corn and mechanically expelled soybean meal were processed. Increasing the residence time in the conditioner by changing mixing paddle pitch resulted in an average 4.5-point increase in pellet durability indices among 65:35 (wt) corn:soybean meal and 65:35 high-oil corn:soybean meal rations.
authors.affiliation: Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, Indiana 47907-1146, USA.
authors.forename: J L
authors.initials: JL
authors.lastname: Briggs
authors.forename: D E
authors.initials: DE
authors.lastname: Maier
authors.forename: B A
authors.initials: BA
authors.lastname: Watkins
authors.forename: K C
authors.initials: KC
authors.lastname: Behnke
mesh_terms: D000821:Animal Feed / Q000592:standards*; D000818:Animals; D002645:Chickens; D005511:Food Handling; D010938:Plant Oils / Q000032:analysis*; D011312:Pressure; D011786:Quality Control; D013025:Glycine max; D013696:Temperature; D014422:Turkeys; D003313:Zea mays
chemical_list: D010938:Plant Oils