Hi - I recently built a new chicken coop using half of my garden shed, including a 25ft enclosure run. i had 5 chicken -4 that were raised together from chicks (currently 3 1/2 yrs old ) and one Americauna that i introduced in October (after keeping seperate for 30 days ). When transfering the "ladies" one of my leghorns gave us a hard time catching her and never seemed to adjust to the new coop . I originally thought she got hurt in the transfer but her limbs were all fine. She just seemed to slow down and about two weeks ago i came home from work and noticed she had runny stool and here crown was paler. I figured i would watch her over night and see in the morning. The next day she became wobbly and had a hard time walking and she past away that night. I thought she had pneumonia. I checked inside the new coop and run and everything seemed fine my other girls were laying and eating fine. ( One week later her sister ( my other leghorn ) started the same wobbly walk - I immediately seperated her into our hospital coop (used when they were babies and we kept just in case we had a sick bird) put her on Tetroxy hca-280 . other than the wobbly walking everything else fine - crown bright red - laying ( i am tossing all eggs ) . i kept her seperated for two weeks and reintroduced her last friday. Well it has been a week and this morning she started wobbling again. No other signs (still laying - looks great ) i am at a loss as to what is wrong. I have seperated her again and back on the tetroxy but i dont know what to do. I dont believe it is Mareks - I am thinking vitamin deficiancy. any suggestions would be great appreciated .