Horse manure, mulching and various trees...

I hauled a dozen loads out of my boss's corrals with my three ton, some loads more rotted than others.
Any suggestions regarding using it on my nut pines, my crab/apple trees and shrubs as a winter mulch? We've had our first frost, and pretty soon I'll wrap most of the stuff up in burlap coffee sacks.

 

I think it needs to be cured via composting before being used as mulch. Here's a Guide to Composting Horse Manure

 

Thank you sir. That was very helpful.