The United States proposed Wednesday stricter standards of beef cattle age testing in a bid to get Japan to resume U.S. beef imports, a senior U.S. agriculture department official said, according to a Dow Jones report.

In addition to chronological examination, the U.S. will use physiological age verification, thereby "more than adequately ensuring that Japanese consumers will not receive products of animals over 21 months and that products they'll receive will be absolutely safe," Chuck Lambert, deputy undersecretary of agriculture for marketing and regulatory programs, told a news conference at the U.S. embassy.

A panel of Japanese experts will examine the U.S. proposal, Lambert said, although the panel's meeting schedule has yet to be set.

The U.S. proposal is part of a renewed effort to persuade Japan that the U.S. can accurately determine the age of cattle, a precondition for resuming U.S. beef imports.

Japan has required that the U.S. be able to prove that cattle slaughtered for export are 20 months old or younger, before easing the ban.