Reiners/barrel racers, please read, feed question?

ours are pasture kept so they get a lot of nutrients from the gr. i have a 17 yr old barrel racer/ team penner and i wouldn't worry too much about glucosamine until your horse is about 9 or 10. they get a red mineral block out there as well. as for feeds they get just regular 14 percent feed. and we get a forage product from stanlee. there available at any tractor supply co. or a blue seal feed store.