I have 3 Buff Orpington Hens and 5 Orpington/ Americana Roosters that are different ages. In the last 2 weeks, their legs have turned from golden yellow on the Buff hens and Greenish black on the roosters to a pure white color and you can see red streaks in them that looks like blood. Is this a sickness or disease? I have lots more chickens but, their leg color has not changed even though some are the same breed as these. Please help!