Rigorous and scrupulous hygiene and biosecurity measures offer the best protection to keep bird flu out of flocks, says Chief Veterinary Officer for Wales, Dr Richard Irvine:
Mae mesurau hylendid a bioddiogelwch manwl a thrylwyr yn cynnig yr amddiffyniad gorau i gadw ffliw adar allan o heidiau, meddai Prif Swyddog Milfeddygol Cymru, Dr Richard Irvine: