Joint forces and livestock officials culled 4,000 chickens in Masum Poultry Farm of Abdul Karim, 2,500 chickens in Lamia Poultry Farm of Anwar Hossain and 2,000 chickens in Patuakhali Poultry Farm-2 of Joynal Abedin.

On Thursday, 1,500 chickens were culled in Patuakhali Poultry Farm in Rajason area following detection of bird flu.

After that, the government took decision to cull the chickens of the farms within one-kilometre area of the affected farm and informed it to the farm owners through a notification.

It also imposed a ban of transportation of poultry products in the affected area.

On Thursday night, 2,000 of chickens of Khulna Poultry Farm of Maulana Alamgir Hossain at Rajason were also culled.

The farm owners, however, claimed the disease as "Ranikhet".