Axis, Fallow, Oryx, Red Deer and Black Buck are mainly grazers, so Coastal Bermuda or Klein Grass are good choices for improved pasture grasses. Any good cattle type native grass is good also. If it gets to tall then shred it back down for new growth. Haygrazer in the spring/summer along with oats/wheat in the fall/winter will work also. I would have planted and prepared before I released any animals. I hope who you bought them from wormed them when at capture. Blackbuck and Axis do not do well in damp/cold/icy weather. Start to work on predators now.