The digestible energy (DE) of horse feed is commonly expressed in MJ (megajoules) which is the same as us having a calorie level on our food. The higher the energy level in MJ the more calories a feed contains. A conditioning feed such as Alfa-A Oil has an energy level of 12.5MJ/kg, whereas a feed for those prone to weight gain such as Hi-Fi Good Do-er has an energy level of 7MJ/kg.