What type of food do horse riders eat?

Are you keeping the horse as a race horse? Or is he/she now a pleasure horse.

If it is still a race horse then a high protein (14%) sweet feed is recommended. You will want around 7% crude fat and around the same in fiber. Also look at the feed tag for selenium and biotin, you should also have vit A, D and maybe E.

Quantity is another question - I feed my trainers 2 quarts in the morning and another 4-6quarts, depending on body condition in the after noon. This needs to be supplemented with 25lb of hay a day divided between 2 feedings.

If the horse is now a pleasure horse then use a pellet feed with about 10% protean and 5-7% fat. The feed should have all the goodies that the above does. Quantity will depend on body condition and usage. Less than above at night if pleasure horse (3-4q)

If you don't know body condition then consult your vet. I have also consulted my vets when switching feed

If the horse is under 4 years of age you should feed OCD supplement.