In recent years there has been increasing interest in adding concentrate feedstuffs at ensiling for a number of reasons. Firstly, from a management point of view, it can be an easy method of feeding a concentrate supplement and secondly feedstuffs may have some absorbent capacity and thus reduce effluent production. However, it is important that the feeding value of the material added is retained during the ensiling process and that the silage preserves well. The objective of this experiment was to assess the nutritive value of silage made by adding dried molassed sugar beet pulp to grass at ensiling, when fed to castrated sheep.