I can't remember exactly Neil, but fats have to be put in to cover their use. First hour the birds fly on carbs, then they move on to their fats. x weight of fats per hour of flight, after the fats are used they start on their muscle until they drop. The carbs contain sugars which convert to fats for storage. I also fed proteins, Sunday Monday; carbs, Tuesday, Wednesday; and carbs / fat mix Thursday, Friday. This year I might just make up a mix and feed them to see how they cope after all they are choosy at times; maybe they know themselves.