We have some of those at work. They move well with flock of sheep and goats but grazing needs would conflict with relatively restrictive ranging habits of chickens. To compensate, either chickens would have to be moved to fresh pasture according to needs of donkey, or a lot of feed would have to be brought into what would be essentially a feedlot for donkey.
What breed is that? It looks much darker than our donkeys, almost like a mule.