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it depends on his feed and pasture situation. it also depends on age and what he is used for and how often.
You will need to feed the next highest amount available on the drop down menu. Or you can feed 13 pounds and then get the remainder by putting the horse in the meadow.
corn corn
oats that's my guess
For a horse living out full time you need at least 1 acre per horse. I would also suggest using a vitamin supplement and if the horse is in medium to hard work then a energy food as well! If you are unsure on what to feed I recommend calling a feed supplier helpline!
They can if the protein content is not too high. Check with your vet to get his recommendation.
There are vitamins that you can add to their feed. You can purchase these vitamin additives at your local feed store. Also, make sure your horse has free access to a trace mineral salt block.
Horses need a certain amount of minerals. Ask your vet which type of horse feed is best for your horse. here's the types of vitamins and minerals a horse needs: http://alpharmaequine.com/info-vitamin-mineral.html and here's more about horse's energy: http://alpharmaequine.com/info-vitamin-mineral.html
On talking about a horses diet he needs everything in a fair amount.
howse answer riding level 3 - corn
you can feed a horse hay, carrots ,apples and you need to feed the horse at less two times a day
on your horse's page press feed and select the amount that your horse needs then press feed again