title: Impact of fiber source and feed particle size on swine manure properties related to spontaneous foam formation during anaerobic decomposition.
abstract: Foam accumulation in deep-pit manure storage facilities is of concern for swine producers because of the logistical and safety-related problems it creates. A feeding trial was performed to evaluate the impact of feed grind size, fiber source, and manure inoculation on foaming characteristics. Animals were fed: (1) C-SBM (corn-soybean meal): (2) C-DDGS (corn-dried distiller grains with solubles); and (3) C-Soybean Hull (corn-soybean meal with soybean hulls) with each diet ground to either fine (374 μm) or coarse (631 μm) particle size. Two sets of 24 pigs were fed and their manure collected. Factors that decreased feed digestibility (larger grind size and increased fiber content) resulted in increased solids loading to the manure, greater foaming characteristics, more particles in the critical particle size range (2-25 μm), and a greater biological activity/potential.
authors.affiliation: Agricultural & Biosystems Engineering, Iowa State University, Ames, IA 50011, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Van Weelden
authors.affiliation: Agricultural & Biosystems Engineering, Iowa State University, Ames, IA 50011, USA. Electronic address: dsa@iastate.edu.
authors.forename: D S
authors.initials: DS
authors.lastname: Andersen
authors.affiliation: USDA-ARS-National Lab for Agriculture and the Environment, Ames, IA 50011, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Kerr
authors.affiliation: USDA-ARS-National Lab for Agriculture and the Environment, Ames, IA 50011, USA.
authors.forename: S L
authors.initials: SL
authors.lastname: Trabue
authors.affiliation: Ag. & Biological Engineering, University of Illinois, Urbana-Champaign, IL 61801, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Pepple
mesh_terms: D000693:Anaerobiosis; D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001419:Bacteria / Q000378:metabolism; D004032:Diet; D004043:Dietary Fiber / Q000032:analysis*; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000032:analysis; D010316:Particle Size; D013025:Glycine max / Q000737:chemistry; D013500:Surface Tension; D013552:Swine; D014835:Volatilization; D014866:Waste Products / Q000032:analysis*
chemical_list: D004043:Dietary Fiber; D008372:Manure; D014866:Waste Products; D008697:Methane
keywords: Anaerobic digestion; Feedstock composition; Foaming; Manure; Microbial community