Zac Mitchell, 20, was injured in April while working on a remote farming property in Western Australia.
"A bull kicked my hand into the fence," Mitchell told the BBC.
He underwent two unsuccessful operations to re-attach his thumb before doctors opted to relocate his big toe in surgery lasting eight hours.
"They put it in the cooler with some ice," he told the BBC.
Mitchell was flown to hospital in the state capital of Perth, but efforts to save his thumb ultimately failed.
Despite initial reluctance, the cattle worker agreed to the transplant operation at the Sydney Eye Hospital two weeks ago.
"It is a bit of a crazy idea...they (patients) do not want to be injured in another part of their body.
"(However) even if you have got four good fingers, if you do not have something to pinch against them, your hand has lost a huge amount of its function," the BBC quoted Nicklin as saying.
Mitchell will need more than 12 months of rehabilitation, but he plans to return to farm work.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)