Have you tried scenting prey with rats? That might make the transition smoother, whether for rabbits or piglets. BTW, the best way to transfer scent is using fresh & very soiled* substrate from a cage of live rats- you might request some from a local pet store if you don't know any breeders. (*roll thawed prey in substrate that is well-soiled with rat urine & feces- "yummy"! LOL)