Hi- my cream legbar chicken, about 6 months old is very down. Very congested sounded, flinging and coughing mucous. Doesn't want to stand. We thought she was just depressed because we took her mate away (she's still in a flock). From reading around on here, I've given her 1cc of Liquamycin LA 200 in her breast IM in two spots, and added doxycline to her water. I couldn't find the dosage for this anywhere, can someone advise. I also added Chick boost to her water as well as raw apple cider vinegar. She is drinking like crazy but not eating. Looking around on here, there are such conflicting advice as the best antibiotics to give. I have Tylan 50 injectable, Liquamycin which I've already given, Doxycycline 100mg capsules, 10% enrofloxacin solution. I breed rats which is why I have all these things on hand. Anyone know which is best to go with and what can't be given with what?