MOSCOW, July 28. /ITAR-TASS/. Russian veterinary watchdog Rosselkhoznadzor has started a probe into products used in McDonald's food chain as it doubts the fast food chain’s product quality, the service’s chief Sergey Dankvert said on Monday.

“Rosselkhoznadzor has intensified monitoring of residual amount of tetracycline antibiotics in cheese supplied to Russia, in particular to McDonald's in Russia,” he said.

McDonald's in Russia mainly used cheese from Germany and the Czech Republic, Dankvert added.

In May, a planned examination in two fast food chain restaurants in Novgorod showed that actual protein, fat and carbohydrate content and total energy value of some products considerably exceeded the amounts declared.

In July, the district Rosselkhoznadzor branch filed a lawsuit. “It is necessary to harmonize the products and information about the content. People should be aware of what they eat,” said chief Anatoly Rossolovsky.

McDonald's opened its first Russian restaurant in 1990. According to the chain’s official site, McDonald's now has more than 400 restaurants all over the country.