I have a batch of 18 week old Broad Breasted White turkeys that I'm getting ready to butcher. However, for the past several weeks, there is a hen that pretty much lays down all the time. She can stand, rarely does, and never walks around. There are no visible injuries, except on her head there are what looks like some scabby healing injuries. I've had her isolated for about a week, and she is eating and drinking, but VERY little. I know birds aren't known for their long, drawn out illnesses, but I would have thought an injury would have healed by now. Any ideas? I hate to lose a full grown bird, but I don't want to eat one that is sick either. Thanks!