We have a chicken with a huge comb. I have heard that when a chicken has a big comb, you should put vaseline on it to prevent frostbite. I have 2 questions: 1. Is this true??? 2. If it is, when should I start to put vaseline on it?? When it is below freezing, or just when it starts to get cold? If you have the faintest idea, please tell me.