Blazing Chargers are the cows of the nether. However, they are hostile against the player. They will charge at you like a bull and will launch you into the air, making you take fall damage as well as attack damage. It is a lot safer to attack them with a ranged weapon then with a melee weapon. Tip: do not fight these near lava; they could toss you in.
Drops: Steak (because it's already cooked in the heat of the nether), and leather.