I got a BR hen and two bantam cochin hens from a fellow bycer. The BR is in really bad shape due to overmating from several roosters. She has no feathers on her head, neck, and back. Most of the rest of her remaining feathers are broken and she looks like she is getting ready to molt. I brought them home on Friday. They are in quarantine in a room in the house. Today the BR started sneezing a little. I had to go in and remove her from the cage when she had hold of one of the cochins by the comb and was dragging her around. When I went to catch her she started breathing really hard. Also her eyes seem puffy. They aren't running as far as I can tell (she is not easy to handle) and she doesn't appear to have any nasal discharge and isn't coughing. I was thinking about treating her with Tylan 50 injections (1/2cc once a day for 3 days). The cochins seem fine now that they aren't being picked on. They all have voracious appetites and have eaten almost 6 cups of 26% gamebird crumbles and drinking well. So my questions are: 1. Does this seem like an appropriate treatment? 2. If it is, the injection goes in the muscle of the breast? On the right side if I'm facing her? 3. Should I treat the cochins or wait to see if they develop symptoms? Thanks in advance for any help you can give.