PREY SELECTION, FOOD HABITS AND POPULATION STRUCTURE OF SYMPATRIC CARNIVORES: TIGER Panthera tigris tigris (L.), LEOPARD Panthera pardus (L.) AND DHOLE Cuon alpinus (PALLAS) IN PENCH TIGER RESERVE

https://core.ac.uk/download/pdf/11822171.pdf 

"Gaur was classified into; adult males (shiny black coat with heavy horns sweeping sideways and upwards), sub-adult males (dark brown coat with a conspicuous dorsal ridge and small dewlap hanging below the chin, large drapes between the fore legs), yearlings (10-20 months old)"