Two of my chickens have combs that are whitish. They are both eat 20% protein layer feed and always have plenty of water. The white hen is 16 months old and has not laid an egg since 7/29. The brown one is 7 months and has been laying about a week (her 4 eggs have had a little blood on the outside, but I assume that's because she's new). The front half of her comb is fine, but the back half looks kind of white. I will try to post pics. Any suggestions?