@ wertthelert, you could always use your land to feed the horse, and when the time is right (and the grass is low), you could just slaughter the horse - and you'll have exceptional meat!
Enjoy your meal!
It would NOT be a good idea to eat a horse and let me make it clear why. If a horse is not raised specifically for the purpose of meat, most of the time in it's life it's been give SOME sort of bute, wormer, ect drugs. If you are keeping a horse even for just a lawn mower you NEED to worm anyway.
So with those things going through the system throughout said horse's life, that would not be a safe meal.