my Delaware hen cant walk, her toes curl and her ankles are bent. she has been eating and drinking and laying eggs fine Ive been giving her poly vi sol for about three days. its been about a week since i first noticed she had been limping now she cant even walk. also my speckled Sussex hen has been limping on her left leg but the toes are not curled and she is laying eggs, eating, and drinking i separated her and the other hen from the rest of the flock and both have been given poly vi sol. what should i do now. also there are 5 roosters and 26 hens (not keeping the roosters for long) its also been cold out.don't think they have Merrick disease because they aren't showing any more signs. they haven't free ranged for about two months because of the cold and snow we give them scraps,cracked corn,birds seed with nuts and reg layer food.