Well grain will put weight on, not help him lose it. If the horse is overweight then you should slowly cut back on the grain and feed more grass hay instead. If the horse is in moderate to heavy work and needs the grain then choose a manufactured pellet type feed designed for overweight horses.
a horse
It all depends on your horses amount of exercise and their current weight. There are all sorts of different grains and types of hay. If your horse is a easy keeper (does not loose weight or gain weight easily, usually stays at the same weight) you should feed him/her plain grass hay with limited grain. If your horse is involved in any sort of competition and is usually working in some way you would be better off feeding him/her alfalfa with grain like Purina Performance Horse feed. If your horse is older you could feed them something like John Lyons or Purina Senior Horse feed. It all just depends on what your horse is like to suite horse horses own personal needs feed wise.
You Should Feed an Arabian Horse a sertain amount of grain. Also if you want to make your Arabian gain some weight, feed them Alfalfa hay, and to make them loose weight feed them grass hay.
two
you should probably be feeding your horse grain instead of liquids
It really depends. If you give a horse grain in the winter then yes you should in the summer but just less then you do in winter.
oats that's my guess
corn corn
This would depend on what you are feeding the horse. You could either refill it from your feed shed if you have a supply, if not you will have to go to a feed store and buy more.
My horses are pastured and I don't feed them any grain if they are not active. However, the horses they I use for eight hour days I do feed a considerable amount of grain and hay as well as grass.
no i have 2 horses grain or oats would be better
You feed mini horses the same feeds as you would feed a full size horse- just in smaller portions. A mini horse should eat 1.5-2% of its body weight every day in forage (pasture or high-quality hay). Depending upon its individual needs (temperment, health, amount and type of work being done- ie pasture pet, cart horse, performance horse), you would add grain and/or supplements.