that looks nasty alright! if you dont know what it is its better safe than sorry. id agree with others about something in there. i wouldnt trust the DNR to tell you the truth either. i shot a doe that had been hit by a car one time. the hind had a patch of gangrene from the wound. i called a family friend and life long butcher about it. he told me to stay well away from the area and the rest was good to go. i trusted him and he was rite, it was just fine. never got a bit sick from it. i tested plenty before sharing it with the family though. lol
you did good frank.