A recent report (January 2019) from the KSDAE highlights the results of DNA analysis carried out on the dung of a wild bull Bornean Banteng in Kalimantan. http://ksdae.menlhk.go.id/info/5312/banteng-kalimantan,-spesies-baru?.html

This bull is part of a herd occupying the degraded grasslands of Padang Long Tua near Long Alango in the Kayan Mentarang National Park in East Kalimantan. The researchers found that despite reports of wild bulls mating with domesticated village cows (Bali Cattle) in the past there was no DNA evidence of introgression (hybrids) between the wild Banteng and the Bali cattle owned by villagers.

Recent DNA analysis carried out in Sabah indicates that the Bornean Banteng is genetically distinct from the the domesticated Bali Cattle of Java and the Banteng of continental SE Asia. The Bornean Banteng can therefore be described as endemic to Borneo with the scientific name of Bos lowii.

Ahmad & Matsubayashi (2014) Is Bornean Banteng a new speciesDownload
Immature male Bornean Banteng feeding on young shoots of lalang grass Imperata cylindrica at Padang Long Tua in the Kayan Mentrang National Park near the Kalimantan-Sarawak Border.
Adult male Bornean Banteng at Padang Long Tua in the Kayan Mentarange NP.
An adult male Bornean Banteng with his harem of females at Padang Long Tua. The preferred food of Banteng are the young shoots of lalang grass the result of repeated swidden (hill rice) farming the same land at too short intervals.
Padang Long Tua is located in the headwaters (Ulu) of the Bahau river in the Kayan Mentarang National Park. The nearest village is Long Alango.