raipur after the death of nine black bucks at nandanvan zoo here within a fortnight experts from indian veterinary research institute bareilly up will visit chhattisgarh to find out the circumstances and causes of death preliminary investigations conducted by experts from anjora veterinary college could not give conclusive reasons for the deaths tests conducted could not detect presence of any bacteria or virus that could have caused deaths principal chief conservator of forests wildlife bn dwivedi said he said a fivemember team from ivri would reach here on friday and a mobile laboratory is also being brought over to conduct tests of the nine black bucks which died in last fortnight six died due to unknown disease and three deaths were caused due to other reasons at present there are 46 black bucks at nandanvan zoo and three animals with symptoms of disease have been shifted to a separate enclosure and are being closely monitored the kind of symptoms developed in affected animals was witnessed for the first time in any zoo of the country nandanvan veterinary officer jaikishore jadiya said initially animals had developed problem with their vision and after few days they completely turned blind besides they also go in rounds continuously at their position which is also an odd behavior dr jadiya said forest minister mahesh gagda visited the zoo on wednesday and asked authorities and forest officials to take up necessary steps to prevent more casualties