Ok so I have this chicken that seems to have the hiccups. My meat birds have had the hiccups before but only for about 10 minutes at a time after drinking. this hen is constantly hiccuping and seems sleepy. Not lethargic just trying to catch some winks, like the hiccups are interrupting her sleep or something. So when the others are on the range she is inside trying to sleep. I was observing her today and noticed she had her mouth open for a bit but not panting. Is this cause for concern?