I'm not big on the beef stuff cause it takes too much room but small stuff I like even meat goats would work on brushy land if anything they clean out the brush for you and when they get ready to roast bring them in and fatten them up on grain and all the garden waste.
Yes, goats and rabbits can't gore, trample, or crush you up against a fence or other solid object. Cattle people will tell you, 'turn 'em out, let 'em breed, fatten 'em up and sell 'em', that's easy for them to say they've been doing it since they were ten. All you need to do it watch cattlemen vet them; the chutes, the catch to hold them. It's expensive and difficult work and cows aren't pets.
Rabbits, per pound have more protein than any other meat.
Goats pretty much take care of themselves and as JF said, clear the brush. Sheep cut your grass.