I have 1 roo and 5 hens. They are austrolorps and about 7 months old. One of my hens is limping pretty badly. I can't see any cut or bruise or anything that looks wrong on her leg. She has been limping for about a week now. Do you have any idea what is wrong with her? My roo sometimes is rough when mounting them but not often, and none of the other hens seem to be in any pain. Thanks in advance for any advice.