That's Donald, and yes he is the herd's breeding bull. He's kept alone alone in the hardstand through the day while the rest of the herd grazes in the paddock, similar to what you'd do with a captive elephant bull.
Normally the saying "the grass is always greener on the other side of the fence" is used metaphorically, but in this case it looks like it may well be true!
Lol, don't think you got the joke cat-man. Dalek meant he intentionally said "try to browse" as the buffalo's efforts at grazing didn't seem to be working due to the fact he's on concrete. Weirdest sentence ever...
