Hello Becky.
If you have 40 horses at your farm, you are in manure heaven!
My suggestion for the long-term: build yourself a series of bins to manage the manure, bedding etc.
Within half a year the effort and expense of building bins etc. will be rewarded by compost suitable for “no dig gardening”.
Have a look at: https://www.youtube.com/watch?v=K9_yWQATxNI
This might help to get you started.
All compost making, in my experience, is an attempt to optimise (i) raw materials input, (ii) labour to collect, assemble and turn (at least twice) the raw materials, (iii) cost of bins, (iv) time to mature, and (v) use the finished product.
If time and energy permits, any photographs of your arrangement, inputs and finished product would be warmly welcomed (in my opinion) by all readers of this forum.
If it helps, and as a guide for your endeavours, a cubic metre of inputs (horse manure, bedding, straw, sawdust etc.) will give you slightly less than half a cubic metre of finished product, suitable for applying on the surface of your garden area. (In other words, to spread a cubic metre of finished, mature compost, you will probably need slightly more than 2 cubic metres of raw inputs, plus 4 to 6 months of time.)
Please keep us informed of progress, if time and energy permits.
Good luck with your compost making and “no dig gardening” adventure!
Kevin
Tasmania (41 deg. south, with a blustery maritime climate, close to Bass Strait)
