If you suspect your horse to have an intolerance to a specific feed ingredient first you need to establish what component of the feed is responsible, which often means placing the horse on an elimination diet.  The simplest way to do this is to go back to basics by feeding your horse a high quality fibre based product and then slowly building your horses feed back up. Rowen Barbary ReadyFibre Mash is an ideal product to use as it is made out of 100% highly digestible fibre, with a very straightforward ingredient list.   Containing just four ingredients without any cereals, alfalfa, barley or wheat it is a very useful feed for horses that suffer from intolerances.  The high fibre levels will help encourage slow rates of digestion throughout the hindgut being particularly valuable for horses requiring a diet that is sympathetic on the digestive system.  With no cereals and a very low level of starch and sugar it is also suitable for laminitics, helping to provide a low energy diet. Once your horse has been given time to adjust to a high fibre diet you can then look at adding a major mineral, trace element and vitamin supplement such as Rowen Barbary Vitem into the diet which will enhance the vitamin and mineral balance for overall health and wellbeing. Depending on work requirements a high fibre diet may be sufficient but for horses that struggle to maintain weight oils can be introduced which will help condition and provide an excellent source of slow release energy, improving stamina in horses working hard.