Flies can lay eggs in wound causing a maggot infestation or "fly strike' which can kill chickens with open wounds. Keeping them inside or protected from flies is necessary in warm weather. There is a product called Swat that you may want to check out later when the wound has filled in and healed somewhat. If you should notice a foul odor or an abscess in the wound, you may then want to use the betadine again once, but it shouldn't be used any more if it looks clean.