New Delhi, June 16 -- A 15-year-old male gaur, a key contributor to the breeding programme at the National Zoological Park (NZP), has died due to age-related complications, zoo officials said on Sunday.

The gaur, also known as the Indian bison, had been under care in an enclosure for the past few days due to deteriorating health, Delhi Zoo Director Sanjeet Kumar said.

Brought from Mysore in 2014, the gaur played a significant role in increasing the zoo's population of the species.

"Currently, there are 15 gaurs at NZP, and over 75 per cent of them are his progeny," Kumar said, adding that samples have been collected and will be sent to the Indian Veterinary Research Institute (IVRI) for further analysis.

The death comes a month after tw...