They all take a huge number of fawns/calves. I'd target a sow if you're truly after reducing predation. Take care of a current fawn/calf killer plus the future ones she might rear.

Any boar will kill cubs if given the chance because it will send the sow back into heat.
Once the fawns/calves drop we'll start hearing of more and more bears taken on the westside sping hunts. The bears will start combing clearcuts in search, making them more visible than usual over here. Watched one push a group of about 12 cows out of their beds in a swampy flat two days ago. I'm sure it was hoping to find some fresh meat.