A worker in a bio-hazard suits gestures as new gas for the culling machine arrives at the entry of a sealed off poultry farm in Hofing, southern Germany September 9, 2007. German authorities started the biggest culling action in post-war history on Saturday at two farms in the Bavarian towns Trumling and Hofing as a protective measure over fears of the deadly H5N1 strain of bird flu. A spokesman said 205,000 birds will be culled in the action that is expected to run into next week.