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For me, spreading it thinly *increases* the amount of flies, at least short-term. It also increases nutrient loss, if you care. OTOH you do not want a big soggy pile in spring or summer (smell, flies, plus it leaches a river of "poo-water" into the groundwater or a stream) so in warm wet weather, if you can't cover your pile then sometimes spreading is good.
In fall and winter, tho, just make big pile, hopefully at least 4' high to help hold in heat. If you get lots of rain or snow, throw a tarp or some old carpeting over the top so it doesn't get too soggy; if you have dryish winters make it flat-topped so it catches rain. Toss a couple shovels of dirt into it too, to speed things along.
It will compost just fine. By spring, at LEAST the lower half of it (probably more) will be really nice composted stuff to use on your garden or horse paddocks. This is true in southern Canada anyhow so it is probably true where you are too
Up here, I find that flies don't become a problem in manure until maybe June - in warmer areas obviously that happens sooner. In my experience the best defense against smells and flies is to make a single big well-structured pile, somewhere it WON'T get rained on and soggy and stinky and contaminate groundwater (like in a shed, or under a heavy-duty tarp), and use "stinky fly traps" to capture what flies do hatch.
Back to CHICKENS though
the great thing about coop poop is that it doesn't have weed seeds in it. So it is GREAT for gardens! All our horse compost sprouts weeds like you wouldn't believe, and I only use it a) in the very bottom of deep holes for rhubarb, roses etc and b) to fertilize pasture.
Pat