No one can give insight without knowing what killed her. A necropsy with lab work is the only way to know definitively what it was and then you can have a plan of action. Here are your state poultry labs. Some states are free, most are inexpensive.
[TR] [TD] 5 [/TD] [TD] Colorado [/TD] [TD] Colorado State University Veterinary Diagnostic Laboratory (Main) 300 West Drake Road, Building C Fort Collins, Colorado 80523-1644 Phone: 970-297-1281 IAV-A, BSE, CSF, CWD*, FMD, ISA*, ND, PRV, SCRAPIE, IAV-S*, VHS*, VSV* [/TD] [/TR] [TR] [TD] 6 [/TD] [TD] Colorado [/TD] [TD] Colorado State University Veterinary Diagnostic Laboratory-Rocky Ford (Branch) 27847 County Road 21 Rocky Ford, Colorado 81067-9466 Phone: 719-254-6382 CSF, FMD [/TD] [/TR]
. I wouldn't give Tylan or any other antibiotic if you don't know what's wrong with them. Of all the things that could be wrong, it is a small percentage that antibiotics can cure. Randomly giving antibiotics is what causes superbugs.