My buddy gets trees out of his cypress plantiation here in Costa Rica that way with oxen. It works well on his terrain which is really steep and uneven. My land´s a little further down the mountain and its flat enough to pull logs out with the tractor, which is easier. They make fun of me because the tractor is more expensive than the oxen, which is a valid point, but you also need about an acre of pasture for each animal just to feed them, at which point you have a lot of land tied up in your utility animals (that would be about half my land). I can just keep my tractor under a small shed roof.
What I noticed about these guys in Tibet, that really impressed me, was that one of them had an ax slung across his back. Ï didn´t see a chanisaw, and it looked like those logs had rounded ends like they had been cut with axes. Now that´s impressive! at least my buddy with the oxen has a nice chainsaw. and those are kinda thick logs too...