The death of around 20 peacocks found in Madhupur village forest in Khordha last week was caused due to poison eating, revealed the postmortem report.
The experts of the OUAT who conducted postmortem said all the dead birds had similar problems in liver which normally caused due to poisoning.
OUAT Pathology department chief Susen Kumar Panda said whether the birds were given one type of poison could not be ascertained in the postmortem.
Meanwhile, Animal and Husbandry Department has decided to send the carcasses to the laboratories outside the State to ascertain the type of poison and also to find out whether all the dead birds were subjected to one type of poison.
Earlier, the National Institute of High Security Animal Diseases (NIHSAD), Bhopal, ruled out avian influenza as cause of death of 18 peacocks found dead in Madhupur under Khurda forest range on December 8.
As many as 18 peacocks, a crow and a crane were found dead under mysterious circumstances in Madhupur area, about 30km from here.