Queensland farms are being placed in lockdown after receiving cattle infected with a disease that causes chronic diarrhoea and leads to death.
A beef stud property near Rockhampton has confirmed some livestock are infected with Bovine Johne's Disease (BJD), a soil-borne illness that poses no risk to human health, but is serious in cattle.
Biosecurity Queensland is contacting properties that may have received cattle from the beef stud.
Queensland Agriculture Minister John McVeigh didn't specify how many properties were under investigation or if cattle sold are believed to be infected.
The discovery of the disease has also led to movement restrictions on the properties affected.
It's believed the restrictions could be in place for several months, with test results not expected to be available before March next year.
"Affected producers are urged not to move or slaughter trace forward stock as this may greatly extend the time a property is under movement restrictions," Mr McVeigh said in a statement on Thursday.
"I understand that this will be a difficult and challenging process for some livestock owners.
"Biosecurity Queensland is working closely with all parties to contain any further infection and resolve cases as quickly as we can."
Mr McVeigh will head to Rockhampton on Friday to meet with farming groups and finalise an action plan.
Affected producers can apply for support under the national BJD financial and non-financial assistance package.