Use the manure in the compost, if you have it at your disposal. That's the best thing for compost, besides fall leaves, depending on who you ask.

If you've never topdressed with compost or mulched around the trees, your soil is probably about spent, meaning there is probably very little organic matter left in the soil. I highly recommend you topdress with compost and mulch around your trees this Spring. Your trees and your soil will thank you.

The mulch will do all the things you've said AND it will increase the amount of organic material in your soil

There are many fruit orchardists that believe that grass sod is the best mulch there is for an orchard while there are others that will go to great lengths to kill any grass in the belief that the grass "robs" nutrients from the trees. I have not seen enough difference between the two schools of thought to think that it is worth the effort to get rid of the sod and mulch mowing that area will help keep the grass under control.
In the fall, after all the fruit is harvested, you could spread compost (even compost containing animal manures) over the orchard and by the time the next harvest is to occur there will be no sign of that compost on the grass and any fruit that drops on the grass will be less likely to bruise while fruit that hits a wood chip will.