Five weeks ago a hen (9 mo. old) started limping. Leg is not broken or dislocated but she would not put weight on it. I separated her and put antiobiotics in water for 4 days...no change. Eating and drinking as usual. Saturday (4 days ago) I put 6 drops of Ivamec on her skin...didn't help as far as I can tell. She is gradually getting worse...holds leg straight behind and doesn't seem to have any control over it. Not eating and drinking as well as before. Her poop was loose but is now normal. I just lost a hen (9 mo. old) that had watery poop, and I have a rooster (9 mo. old) that has started limping. All three chickens are from the same clutch. I don't know what to do...need advice NOW.