I have been keeping chickens, rare, heritage, and standard breeds for over thirty years. I have seen a few diseases and unusual occurences. I do have a mystery at hand, in the last two months I have lost six hens to broken legs. Has anyone else had a problem with a 'reoccurent' breaking leg issue. It began with an older hen and has ended with two of my slightly over a year old girls...I have looked over their area and cannot figure out how this is happening. Does anyone have any ideas. They are in an enclosed run, approximately 40 X 40 in the front of the hen house and 30 x 10 in the back....I just don't know...the end result, after a wasting away, is death.