The number of Alberta ranches under quarantine because of bovine tuberculosis has expanded to 33 from 30.
That is according to Rich Smith, with Alberta Beef Producers.
The quarantine will remain in place while the Canadian Food Inspection Agency tests the cattle to find out if any are infected.
Still only one case has been confirmed, at a ranch about 250 kilometres east of Calgary.
The Canadian Food Inspection Agency says the investigation into bovine tuberculosis in southeastern Alberta will stretch on for months.
The investigation includes tracing animals for contact going back five years and testing all animals in the affected areas.
Cows from three farms will be destroyed.
Meanwhile, additional CFIA staff have been sent to Alberta.
In a release on Thursday, the CFIA said it is working with the province to ensure any risks involving wildlife are included in the investigation.
Genetic testing has shown that the bovine TB organism from the infected cow is different from any strains so far detected in Canadian domestic animals or wildlife.