Bradley Lawrence Mykael Gee, 30, of Burnie, was found guilty by a Supreme Court jury in Launceston of persistent family violence against his former 25-year-old partner between May 2018 and June 2019.

To have committed persistent family violence the jury was required to find at least three counts of assault proven.

The woman gave evidence of eight separate incidents which included six assaults and two counts of wounding.

In sentencing, Justice Robert Pearce said it was his duty to find the facts because the jury could not agree.

He said some of the acts were cruel and demeaning.

He said he did not share the jury's doubts and was satisfied with the truth of the complainant's evidence.

Justice Pearce said he was satisfied that an incident in which Gee locked the woman in a dog cage and threatened to burn his car with her child inside had occurred. He also sprayed her with a hose.

"It is implausible that the evidence could have been fabricated," he said.

He said he was satisfied that she suffered a head wound after Gee hit her on the head with a torch while they were wallaby shooting and a separate count when he stubbed a cigarette out on her chest.

He said Gee's significant criminal record was a factor including a 20-month jail sentence in 2013 for causing grievous bodily harm after punching a man in a hotel, breaking his jaw and leaving him unconscious on the toilet floor of a hotel.