Hopes for a speedy resumption of Canadian beef exports to the US may have been dashed after the two countries disagreed on the way the age of cattle would be assessed. The US said last month it would resume imports of boneless Canadian beef from cattle under 30 months old. One way of judging how old cattle are is to examine their teeth, but officials on either side of the border have not been able to agree on when the check should be carried out, according to Claude Boissonneault, chief of red meat programmes with the Canadian Food Inspection Agency.