In Odisha, about 20,000 birds have been culled in a farm of Central Poultry Development Organisation (CPDO) at Bhubaneswar following detection of avian flu H5N1 virus.Culling operation will resume today in the CPDO farm and the rapid response teams formed for the culling operation plans to cull rest of the 9,000 birds in the farm.AIR correspondent reports a huge pit has been dug to bury the culled birds and elaborate arrangements have been made for disinfecting the area.Five more rapid response teams have been engaged for creating awareness among the people in Bhubaneswar. The culling operation was launched after the Odisha government received an advisory from the Centre to eliminate poultry birds at the CPDO farm and three km radius area around it.The culling operation in other areas of Bhubaneswar is likely to be completed in five to six days.The H5N1 virus was reported at the farm after culling took place at Keranga in Khordha district and Betanati in Mayurbhanj district of Odisha last month. CPDO had sent samples to the High Security Animal Disease Laboratory (HSADL) in Bhopal, which confirmed the detection of bird flu virus.