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Abstract
Flachowsky, G., Richter, G. H. and Löhnert, H.J. 1995. Composition and in sacco degradability of variously treated pig slurry solids before and after anaerobic digestion. J. AppL Anim. Res., 7: 161–168.
The fresh and digested pig slurry was separated into a solid and liquid phase by centrifugation. The solids of the slurry (fresh and digested) were treated with urea and I or NaOH and used for the estimation of chemical composition and dry matter degradability (DMD). Anaerobic digestion did not significantly influence chemical composition except iron content. The DMD of anaerobically—digested solids was significantly lower (34.8%) than that of the influent material (48%). Chemical treatment of solids from the influent increased DMD from 48.0 to 54.5 (2% urea), 60.2 (2% NaOH) and 62.0% (2% urea and NaOH each); DMD of effluent was increased from 34.8 to 46.4, 49.4 and 51.3%, respectively. Pig slurry solids from the effluent of anaerobic digesters contain low energy for ruminants and should primarily be used as manure.