The big one is public liability. If your animals escape and cause a road accident with a coach load of nuns and mothers-in-law then the costs come down to you. Employee liability is less of a problem usually for smallholders except when they pay a friend to so something and he loses an arm in the baler.
Pretty much everything else is normal replacement for stuff nicked. You should be able to download a policy from the NFU Mutual which will give you pointers. I use NFU but I'm not a big fan and will be getting quotes at renewal time.