I've got these guys growing ALL over my front yard, I never once considered them for a feed? Let me know how it goes for you, though. I'm trying to cut back my wild blackberry bushes a bit (they're so out of control we're talking about 7ft high and at least 200ft diameter. You can;t walk around at all. I feel guilty doing anything to it because of my rabbits, but it's gotten so out of control that the goats wont touch the stuff.