Hello All, This is my first winter with chickens. We live in north Jersey so we get pretty cold up here. I have Tetra Tints and they have reasonably sized combs. I have heard about using Vaseline on their combs to prevent frost bite. Is this something that is to be done daily, weekly, just when it is going to be really cold or only if it seems like the chickens are showing signs of frost bite. Any information would be greatly appreciated! Thank you!