I have 9 chickens and 4 of them are Roosters, 22 weeks old. About a week ago I noticed that the roosters were wheezing and yesterday I noticed that two of the roosters combs had purple on the tips but not all the time. I have done a bunch of research and can't figure out what it is? And ideas / suggestions would be great. There are NO other symptoms such as sneezing, watery eyes, discharge from the nose, etc. All the girls seem happy and healthy and I got my first egg this morning. I'm new to chicken keeping and am confused by this. They are my pets, so I really don't want to cull any of them. I am getting more hens in May to even things out. Thanks in advance for any advice!