The number of herds under quarantine for bovine tuberculosis in Western Saskatchewan and southeast Alberta is shrinking.

The Canadian Food Inspection Agency's chief veterinary officer, Dr. Harpreet Kochar, says there are no new cases of bovine TB following the discovery of six infected animals from one herd this fall.

He says 45 herds are under quarantine but movement controls have have been removed from six premises after testing negative.

The number of farms in quarantine has decreased but Kochar expects more premises will need to be quarantined before all testing is complete.