Chaff is produced by chopping up the hay into smaller pieces. This make it easier for feed it set quantities, good for mixing other products with and less mess than traditional hay bales. It is also easier to digest than hay so it is great for young ones and older horses.
Oaten is ideal as the basis for your feed mix. Lucerne may be too rich for many horses especially those with minimum workloads or those grazing green grass.
Trickle feeding fibre such as chaff (a little at a time) encourages horses to chew, producing much more saliva than when concentrates are fed on their own and this alkaline saliva buffers the stomach acid. The presence of a high fibre feed such as chaff in the stomach helps to neutralise stomach acid.