Tests show thousands of Australian sheep were free of infectious diseases when they were inhumanely killed in Pakistan, with the remaining sheep now likely be slaughtered for human consumption.

Karachi livestock bosses culled between 7,000 and 10,000 sheep because they thought the sheep had viruses like salmonella and anthrax.

Some were buried alive or clubbed to death before a court order halted the cull.

For the past few weeks, the remaining sheep have been in holding pens in Pakistan and their fate has been unclear.

British tests now show that the sheep are free of infectious diseases.

It is still uncertain what will happen to the stranded sheep, but WA-based exporter Wellard says it is likely they will be killed for human consumption.

"The Pirbright report, which was requested by the Sindh High Court, validates our belief and our efforts," Wellard said in a statement.

"We refused to accept the culling process forced by the Sindh Livestock Department and have done everything in our power to ensure their welfare was protected after we were forcibly removed from caring for them."

Wellard says the tests prove the sheep are no threat to human or animal health in Pakistan.

The Sindh High Court is hearing an application to overturn an order to kill the sheep.

The court asked for tests from the Pirbright Institute, based in England.

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The lab report tendered in court says the scabby mouth virus is present, but it is not fatal to animals or humans and other infectious viruses are not present.

"The interpretation of these results is that because no antibodies to these disease agents were found, then the sheep were not infected with these diseases and there is no reason to exclude them from being processed for human consumption on these grounds, subject to the usual meat inspection processes," the report said.

Wellard says the Pirbright Institute is one of the most respected in the world.

The court hearing is the latest in a long saga for the shipment of sheep.

They were to go to Bahrain, but were rejected because of the scabby mouth outbreak.

Wellard then found a buyer in Pakistan and drew up a live exporting agreement and the Federal Government approved it.

Tariq Mehmood Butt, the Pakistani man importing the sheep, is quoted in local newspapers saying he is confident the court will overturn the cull order.

The case has been adjourned until next Wednesday.