New EU rules on the use of antibiotics in farming may lead to a ban on some British food exports.
Restrictions on the administration of antibiotics to groups of healthy animals came into force in the EU on 28 January.
Antibiotics can only be used as a preventive measure in exceptional cases.
UK meat, fish, dairy and eggs exports may be banned by the EU as antibiotics are still widely used in UK farming.
Excessive antibiotic use is the main reason for antimicrobial resistance.