Today I noticed that my 13 week old Minorca seems to be having trouble walking, her knees are weak and she kind of hobbles close to the ground, whats wrong? Just last week she was faster than my leghorn! is there anything that I can do for her? she can still walk and is part of the pecking order, and seems to be able to get around just fine. One of my older hens did this and it quickly deteriorated into marble Bone Disease and there wasn't anything I could do for her. Thanks in advance!