I can't find any information on whether or not deer poo is "hot" or "cold" manure. Personally (with nothing to back it up except personal experience w/poop) if the poop is in round pellets, I would think it's a cold manure, meaning it will slowly break down in the soil, and can be used directly, without composting first. If it is in clumps it may be more hot and possibly burn plant roots. Deer are very closely related to goats (which I have) and goats have cold manure. I read somewhere that any animal w/round poop pellets produce cold manure. We've used goat and rabbit pellets for years (direct application) with nothing but great results.
You might want to look into make manure tea with it to water your garden!
