Does anyone know what is causing this sudden change in our hen's legs? this is a standard cochin 5-6 months old who never had a moment's trouble until suddenly 2 weeks ago we found her hobbling, slapping her feet rather than placing them and turning her knees in. as an immediate reaction we isolated her and added vitamin/mineral mix to her water. She still has good weight and eats well so whatever is causing this problem is not causing her to lose her appetite yet. Her color is still good as well. Is this a vitamin/mineral deficiency? or just a congenital malformation? Is there anything to be done to correct it? there doesn't appear to be any bone breakage or trauma as far as we can tell. she still has use of her feet so they're not floppy and both feet can still grip. Any advice is most appreciated.