Hi CP,
Over the last year our horses have lived out over the whole year as it has been so mild. Hence, most of the manure I get is from field pickings; pure manure. I do 2 things with it:
Over the winter some goes into the compost bin with the other ingredients which includes the straw from the chicken coop weekly clean. This makes normal, fairly weed free compost.
The rest, and vast majority is left in a heap (which gets to a cone about 6 feet high) to do its own thing. After some months I have been spreading this 6 inches deep to make new beds. I know many seeds germinate from this so either these get hoed as soon as they can be seen, or if feasible I cover the new beds with black plastic (not weed fabric) for a few months. This kills off the weed seedlings plus whenever it is uncovered there are a lot of fugal fruiting bodies visible so I believe it is helping fungus formation and final breakdown into compost.
Hope that gives you a perspective.
Good luck,
Derek