Hi, this is my first winter with chickens. I have been applying vaseline to the ones with large combs in the past few days and I am planning on doing so as long as the temps go below 20 or 25 degrees. My question is: do you need to put vaseline on them EVERY night when it gets this cold? I have been putting it on in the evening - lots of it - and the next morning I can't even tell that I had put anything on them. Do you only put it on the comb or also on the waddles? Thank you!