Animals Australia has lodged a complaint about alleged breaches of Queensland animal protection laws over the treatment of a bull which broke its leg at a rodeo on Saturday.

The animal welfare group says it had two observers at the Warwick Rodeo in southern Queensland who captured the bull's distress on video.

Director Glenys Oogjes says organisers' attempts to herd the injured animal out of the arena prolonged its suffering.

She says at one stage a ute was used to try to push it out.

"It went on and on with the bulls coming into the arena to help him to herd him out," she said.

"He was further injured by them and then it was some half an hour later before he was loaded onto a truck, which in itself is a breach.

"He should have been put down immediately."

Animals Australia says Queensland's rodeo laws are the weakest in Australia, with no requirement for a vet to attend or for injuries to be reported.

The ABC has contacted the organisers for a response.

The Australian Professional Rodeo Association says the bull was treated humanely and spokesman Steve Hilton says his organisation will fight the complaint.

"I can't imagine that anybody can stand up and say that job could have been handled any better," he said.

"There's no other way we could have got that bull off the arena and I think they sort of dramatised the whole thing a little bit.

"[It's] not like we're cruel people, we really do try and look after these animals to the best of our ability and everybody's devastated with the loss of that bull."

Mr Hilton says the animal was treated humanely.

"You wouldn't be able to go out into the arena to euthanise him for a start - you've got to get him to a place where you can do that," he said.

"Where the bull's in the arena like that you can't just rush out there and do anything and like I said, everything was done that could possibly been done."