Under 30 months rule

Under 30 months rule

refers to the ability to market cattle aged under 30 months, based on experimental challenge studies of calves with bovine spongiform encephalopathy (BSE) infected brain have shown no infectivity in edible tissues (non SBO/SRM) prior to 30 months.
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She said that Britain's date based export scheme, approved last November and taking effect from August 1, had other tough conditions in addition to the under 30 months rule.