There have been no studies documenting the safety or appropriateness of high-fat feeding to IR horses. The only fat insulin-resistant (or any) horses need is a supply of the fatty acids they are unable to manufacture themselves: omega-3 and omega-6 fatty acids (which they would normally
ingest from grass). Learn more about appropriate diets for IR/EMS and PPID equines at: https://bit.ly/2HV5Gqs