Our D'Uccle roo used to be a very LOUD , and noisy guy. He would crow all day long every time we walked to the pen to feed, and for what seemed to be no reason at all. He's a beautiful boy and looks no different then normal good weight, eats, drinks, and breeds his hens. However he can't crow any more he try's to and all he can get out is a raspy little start of a crow then nothing else. I noticed this about 2 weeks ago and have been watching him closely since. As I said he's totally normal in every other way just can't crow any longer. Should I be concerned? Has this happened to anyone else?