How much feed and hay do you feed a Tennessee walking horse daily?

It depends on the amount of work he is doing. He will need at least 1.5- 2 % of his body weight in quality hay or pasture, though. As for grains and supplements... A horse in no work or light work will need little to no grain. My walker eats 2lbs of a low calorie complete feed to make sure he gets all of his vitamins and minerals, but he doesn't do hard work. The more intense the work your horse is engaged in the more calories he will need to consume. Always keep as many of these calories as you can in forage and not grains and supplements. Also, walkers eat just like any other horse.