I wouldn't use them for bedding. Several reasons, but mainly, they will be large thick chips and also the oils in the pine are not good for poultry.
Kiln dried pine is fine, like in store bought shavings. In those the heat of kiln drying has either cooked off most of the oils or "fixed" it into them.
Also, the large chips from a tree service will take about 5 years at the quickest to start to rot and break down, so you can't really use the bedding in composting.
I work for a tree service and do use our chips to compost, but even with a huge pile and manually turning it with a skidsteer and adding starter, top soils, leaves and green trimmings it takes several years to see much change in the compost. My regular pine bedding from the coops breaks down when mixed properly in under 6 months.
If you have any low places in the run or yard the tree chips are great to fill in and keep it from getting muddy though or you can use it like mulch around trees and shrubs.