Right to Information documents obtained by the Greens confirm multiple reports of animal cruelty including claims of eye-gouging of cows, routine breaking of tails, injections for illegal substances to induce birth, calves being killed with claw hammers or left to starve to death and cows being shot then picked up with pitch forks while still kicking.

In Parliament, Greens leader Cassy O'Connor called on Primary Industries Minister Guy Barnett to commit to routine unannounced visits to all of VDL's dairies in the North-West.

Mr Barnett said Biosecurity Tasmania carries out a range of inspections, many of which are unannounced.

"With respect to VDL, there would be many inspections over a long period of time," he said.

Mr Barnett said he followed up on the allegations raised in Parliament by Ms O'Connor immediately.

"There has been an investigation already by Biosecurity Tasmania. There has been found to be no non-compliance at all," Mr Barnett said.

Ms O'Connor said following her question in Parliament on Tuesday, a former VDL worker contacted the Greens to provide further detailed allegations of cruelty.

"This whistle-blower alleges he witnessed cow tails being broken as a matter of routine, watches as hoses were shoved inside cows that have just given birth to fill their uterus with water or air, seen cows starve to death, and hundreds of bull calves needlessly shot because they are too small," Ms O'Connor said.

"It is simply not good enough for Biosecurity Tasmania inspectors to accept the assurances of farm managers, when, for example, they claimed broken tails came from previous owners, or that calves reported to be sleeping on gravel were provided with bedding."

When asked if he did not believe the account of cruelty from the former VDL employee, Mr Barnett said those with concerns about animal welfare should make direct contact with the authorities.

"Those concerns should be expressed immediately," Mr Barnett said.

"We take animal welfare concerns very seriously."