Russia’s agricultural watchdog Rosselkhoznadzor has announced that Canadian pork imports to the country would be limited starting Friday over concerns of prohibited feed additives, the watchdog’s press service said Thursday.

“During laboratory testing…a stable increase of instances over the last 10 months has revealed that a number of harmful and dangerous substances, including ractopamine, a pharmaceutical muscle growth stimulator prohibited in the Customs Union, was found,” a statement by the watchdog said.

Ractopamine is banned in the European Union, mainland China and Russia.