The Middle Ages did not function on a currency system as we know it today. Most people grew what they needed to survive or bartered for it. For example: if you lived in a village and needed food for your draft horse, you would plant a certain number of acres that the Lord gave you in wheat or oats. Some would go to the Lord for taxes, some to the Miller for flour and some would be set aside for ol' Blacky. If you were the Lord of the Manor then of course your wheat or oats came from your peasants whom you so graciously let stay on your property. There were really no other horses outside these venues as no one could afford to keep anything (animals or children) who did not earn their food through labor. Unless, you were a traveling soldier for hire then you either let you war horse graze in whatever field you were camping in that night, paid for food for your horse along with your lodgings at an inn with coin earned in your last battle or your horses care would be seen to by whatever Lord you were serving at the time.
I feel there are two questions here:Serfs could never ever afford a horse in the middle ages.The cost of feed: The cost of feed was immaterial as to own a horse you had to be rich enough that others were paying you tax and how they paid was farm products mostly.
You should feed your horse 12 to 15 pounds.
What section of Africa carried on much trade during the middle ages
Sweet feed, sweet feed, sweet feed
Feeding a horse beet pulp can vary from horse to horse. Depending on if you have others in with them or how much you horse takes in daily. For me its usually 1 and a half scoops but again it varies. That is a question for your local feed store or your local vet.
It affected Much of the middle east and india.
It depends on the horse. If your horse is fat then you need to cut down on the horse feed, but if your horse is too skinny then you need to increase their feed until the horse gets back up to his/her weight.
It depends on how much the horse is ridden, and whether or not the horse lives in a pasture, stall, or has limited turn-out.
how big is the animal??
Not much
They did not make much and worked for the lords and their wives
you should probably be feeding your horse grain instead of liquids