What types of feed would be good for my filly born in may who is completely race bred top and bottom lines (she will be used asa barrel horse)?

Every horse is different. I own race bred barrel horses and for the more high strung I try to stay away from feeds with tons of sugar. Barrel horses are also prone to ulcers. Try to avoid grains that will cause issues. She is still a baby, so u also want to be careful not to overdue thw grain anyway so she doesn't grow too fast.

Ultium!!! I swear by it! My friends ottb looks like a quarter horse and she runs her in barrels!

Purina strategy is what I use. Triple crown feeds are also good