Federated Farmers says speculation around the cattle disease Mycoplasma Bovis and its origins is just adding more stress to worried farmers.
The disease was first detected on a South Canterbury farm by the Ministry for Primary Industries (MPI) last July.
Since then 17 farms have been identified as having animals with mycoplasma bovis with a further 34 properties placed under restricted notice.
Federated Farmers national president Katie Milne says in the current circumstances "patience and a dose of realism" is required.
"Of course there is curiosity among farmers and the media as to how mycoplasma bovis started as it has never been detected before in New Zealand to our knowledge.