Just put mine all on BOSS too... I like it so far, the horses seem to enjoy it too. I use it for treats alot of the times in addition to feeding.
From an new vet and nutrition freak:
"It a good quality oilseed so it works sort of like a hot oil treatment from the inside out. It enriches and moisturizes the skin and hair coat as well as providing a good source of fats for the horse's energy demands. You could do the same thing feeding straight oils, but it is easier to feed and more palatable to the horse. It also contains proteins and fiber for more added nutrition.
Start feeding your horse about 1/4 cup of BOSS and then increase it by 1/4 cup once or twice a week until you reach a level that is working for the coat. A cup a day is usually sufficient for most coats."