Unlike buffalo chips, horsesh!+ rots quickly, producing a lot of heat; that was th basis of gardening hot beds. You just might be onto something!
My dad has my cousin bring his horses up every summer to graze in his small pasture, a couple of times every summer. Dad then collects the manure and spreads it on his garden. I asked my dad one day WHY he needed corn 14 feet tall. He just told me to shut up and climb that ladder....