I have noticed that at times my two large roos (one Buff Orp and one speckled sussex) combs get purple tips to their combs. Sometimes they are completely red and then like tonight there was a lot of purple on the BO and none on the SS combs. What is this from and is it a problem? Is it something to do with their hearts - hopefully this is just me being neurotic! They are 20 weeks old now and are the only two heavy breed roos left as the others have all landed up in the pot!