I'm intrigued by the mention of antler.
We sell the StagBar antlers in our pet shop, and I had wondered whether that was something a ham could chew. We also sell the StagBar multi-chews, which is a large piece of antler with rope and rubber ring to chew, which made me think of psyco-chewer Tansy. I wouldn't use the rubber ring though, too dangerous for my nutcase. :L
I know some rodents will gnaw bones and antlers in the wild, which made me wonder.
Do they actually like them?