I have a 6 year old TB and he gets a lot of food..at least it seems like it to me.
In the morning he's getting a pretty standard scoop of 10% sweet feed, nothing special, but in the evenings when I come out to feed him, he gets 1 standard scoop of beatpulp (dry, I soak it) and one standard scoop of Pennfield Fibergized with the Omega.
Supplement wise, he gets 3 scoops of Cool Calories, 2 1/2 scoops of Fat Cat and 1/2 scoop of electrolytes, just to make sure he drinks and gets the minerals he needs. (he will NOT lick a salt lick or mineral lick)
I ride him 5-6 times a week, jumps 2 days, and the others are flatwork/galloping trails. So he has a pretty busy schedual. He gets at LEAST one day off, and another day or so if he is really tired from the previous day.
On a side note that is probably important: within the past month we have jacked up the amount of food he's been getting because we left a barn that he came fat as a tick to, and when we left he was just barely showing ribs. Mostly we are trying to pack weight on for winter, and to cover the massive amount of energy he is burning during his workouts. He has never in his life gotten so much food, or any supplements for that matter. He used to be on Triple Crown Complete, that was great in the summer, but he ended up being allergic to the rice bran in it, and the reaction made him really hot, and unmanageable.
Also, to see the percentages in the Fibergized Omega, just go to Pennfields website. If you email them and fill out a form, they will send you a coupon for a free bag if you want to try it :) (my horse is on it because another person suggested it and said their horses do great on it)
Also, also, lol. He is field boarded on a pretty well grassed pasture, so he has roughage and movement all the time.