I know muntjac won't respawn unless you shoot females too. I noticed barasingha were taking a while it seemed, but then suddenly started. If you aren't finding stuff reboot the game from desktop it usually helps. Also, try going to the left most outpost on the map then to the right most outpost on the map, then to the leftmost again, and then go to your tiger areas. I've been grinding tigers and that's how I get them to spawn at their lakes.