My rooster has been crowing for a couple of months now. He has a pretty healthy crow. A couple of days ago I noticed a sort of raspy sound each time he crowed. He's still doing it. Each time he crows, when he takes his next breath, it sounds like wheezing. He still has all his energy and doesn't appear to be sick other than the noise he is making. It also only happens when he crows. I don't notice the sound any other time. Do you think he may be sick?