We left Monday for vacation. When came home Thursday afternoon, let the chickens out, everyone seemed fine. Then around 7pm we noticed our rooster missing, he had already gone to the coop to roost. Next morning he seemed a little lethargic, like he was very tired, crowed but only 6 times. We saw him drink through the day but not eat. He refused to leave the chicken yard and range with the hens, showed no interest in them at all. We just figured he was stressed due to the change and us being gone. We searched him over for injuries, or mites or anything on him and found nothing. When we got up this morning he refused to come out of the coop, we brought him out and offered him food and water, he just walked away and sat down, then I noticed his comb was very cold and starting to turn a purplish blue, he was breathing very hard and within 15 mins was dead! HELP!!! I have 4 hens, they all seem fine! I am also hatching eggs, the first 2 hatched this morning. Any ideas what happened, He was a young roo just abut 3 yrs old.