Officials feel disease or food poisoning could be the probable causes behind the spate of deaths at the Park in Prachuap Khiri Khan province, the Department of National Parks, Wildlife and Plant Conservation said.
DNP director-general Theerapat Prayurasiddhi said veterinarians and National Institute of Animal Health experts are looking into the issue and plan to collect soil specimens.
Theerapat said consumption of contaminated food was the most likely cause.
All the dead animals were found in the Kunshorn forest plantation project.
Veterinarians are also looking into disease as a possible cause of the deaths.
Gaurs are among the largest living land animals. Only elephants, rhinos, the hippopotamus and the giraffe consistently grow heavier.
