The flu was identified among 10,500 rearing turkeys at a farm in northern England More than 10,000 turkeys will be culled at a British farm after a bird flu outbreak was confirmed by the Department for Environment, Food and Rural Affairs (Defra).The flu was identified among 10,500 rearing turkeys at a farm in northern England, Defra said late Saturday, with all foul to be culled to prevent a spread.