Cut a golfball size hole in a towel or old tshirt put roosters head through and use sharp scissors. After cold water to slow bleeding and then coffee grounds. The coffee also speeds recovery. Make sure to tie feet and wrap wings with tshirt or towel to prevent them from beating you.hope this helps.
sulmet from your local feed store. Or farmers co-op would do the trick unless you dont give your birds antibiotic. I usually have to dose mine. I think its around 10$ a bottle and you mix with water. Works for me if I can catch it in time
Kingcocker.... what breeds make up a Vietnamese gamefowl? I work with a man that has a couple stags he ordered over seas. They look like a asil type or shamo idk