My roo sounded great this morning. Tonight when I went to shut the coop he crowed and the first part was loud like usual but the "doodle doo" part (if you will) was raspy like he's loosing his voice. His eyes are clear, he is eating and drinking and otherwise acting just fine. Should I be worried? He does crow pretty excessively throughout the day. Could he have just overdone it? We are supposed to have snow and -2 degree weather tomorrow so I'm worried anyway - now extra worried!