Often shredded grain is stored up to feeding as bulk material in tower silos over a longer period. Due to time-dependent consolidation the material becomes more or less incapable of flow out. In this research, the flow characteristic of pig-feed is determined in dependence on the granulometric conditions and the storage period. For the investigations three samples of mixed pig-feed were produced with a transformed median x(50;3)* of 0.335 mm, 1.0 mm and 5.2 mm and a constant standard deviation of 0.9. The percentage of cohesive fine material with particle size x<0.2 mm was 100%, 30% and 8.9% in order to represent the flow properties "very cohesive", "cohesive" and "free flowing". The material samples were pre-sheared by use of a translation-shear-device and afterwards stored for 20,40 ore 90 h under the consolidation stress. After that followed the shearing of under reduced normal-stress. The flow function values ff(c) were calculated based on the measurements. Results show that the flow characteristic is mainly influenced by the fine material portion H-3(0.2 mm). Extremely cohesive behavior is present at H-3(0.2 mm) = 100%. At H-3(0.2 mm) = 30% or 8.9%, the bulk material behaves cohesively or cohesionless. Shredded grain for animal feed should have a small standard deviation and a portion of cohesive material H-3(0.2 mm) <5%. (C) 2012 Elsevier B.V. All rights reserved.