by Dr Derek Cuddeford,  Royal (Dick) School of Veterinary Studies, University of  Edinburgh In-wintered horses will undergo a major transition in their feeding programme when it comes to spring turn-out. The magnitude of the change rather depends on the quality of the forage that they have been fed overwinter. They may have been fed a very high fibre hay low in non-structural carbohydrates (NSCs) or in contrast they may have been fed a very high quality haylage that was much lower in fibre but higher in NSCs. The latter provides many more calories than the former on an equal dry basis. The NSC content...