I had to seperate my roo from the flock for a few days because he was pulling the saddles off of my hens that lost back feathers (see "rooster thinks saddles are the enemy"). It got very cold one of the nights (-8) even though it wasn't predicted to, and his comb and wattles got frostbitten. Now there's black dead skin on his wattles and comb tips. I'm afraid of gangrene. Can't afford a vet and I'd hate to cull him since he's a very good roo. What can I do for first aid?