I have an adult white layer female and she cant seem to walk very well. Some days she seems okay then other days she wont even stand. Sometimes she will try to walk and limp and spread her wings out and try to walk with her wings. Sometimes she just stumbles when she runs. I'm not sure what's wrong with her to where it comes and goes like that. I feed her layer crumbles and cracked corn but none of the other ducks have this issue. I've tried niacin and it didnt help so now im trying to soak her in an epsom salt bath to see if that helps. There's no visible injury to her legs. It almost seems like her legs just get too weak to carry her sometimes. I'm really not sure what to do but don't want to pay a huge vet bill...any ideas? Thanks!