Have you heard of vermicomposting? I have a friend that allows me to get all the horse manure I like, I feed it to my worms they in return produce womcastings.
If you go this route of composting, becareful of your deworming schedule. The earthworm is not the same creature a intestine worm is, but dewormer kills them the same. I wait a few days after she deworms her horses before I collect the manure.
It is wonderful, I don't think it is too hot(high in nitrogen), I have oat and barley seeds sprouting and growing well in my compost. I just turn it and kill the sprouts, but they keep coming back. They grow very good in fresh manure, but its the decomposition of the manure that feeds the plants. So composting it helps, by giving the microbial activity time to produce plant available nitrogen.
I have seedlings in a mixture of vermicompost(composting manure, worm castings, worm cocoons) with two week old horse manure. Its about 50/50 and they are doing fine.