My Serama hen started gurgling slightly when excited a few months ago. Otherwise she acted fine. When she began gurgling more often, I gave her a full, five day course of oral Tyan 50. She seemed better, but now, a few weeks later, she is gurgling more than ever. I can't tell if she's just broody, or also feeling sick, as she stays in the coop most of the time except when I make her come out. She is eating, although not as much as usual. I have Tetracycline powder for fish that is 500mg per packet. Can I give her this? I have no vets around here that know about chickens. What would be the dosage? I really want to save this very sweet hen!