When I am older, I want to have two Quarter horses mostly for leisure and becuase I simply enjoy their precense and what it involves for caring for them. My question is, does it cost less in the food department if your horse has access to a lot of land to graze? For example, lets say two horses had four acres of grassland to graze in 12 hours a day. How much would they eat in grain and hay? Also, I worked at a horse farm once and I never recalled seeing them feed their horses grain. Is grain completely necessary or is it just something you can do for your horse?