Hi folks, I have 3 chickens which are approximately 1 year old. One of them developed a slight limp a few days ago and it has now progressed to her being unable to stand. Initially she was able to stand when I supported her but now she just remains sitting and if I lift her she takes a few steps then stumbles and falls. I have read a little on Mareks disease recently but she doesnt seem to be showing the classic one leg forward, one leg back posture or head/neck paralysis which is described in some of the literature and as far as I am aware they were vaccinated. She is still eating, drinking and laying but as she cant move aroud she is probably not eating as much as usual so I am worried she may become even weaker. They are mainly fed layers pellets with occasional mealworms and veg as a treat and forage in the whole garden(no toxic plants in the garden either just a pet sheep who seems to think shes one of them!). I thought the diet would be nutritionally balanced for them but is there a specific vitamin or mineral deficiency that could cause her to become lame/weak? One of the other hens has a slight limp but has had that for a while and I think that is from a strain/sprain (I noticed her getting onto the garden wall then landing in a bit of a heap when she decided to get down the quick way!) I'm pretty new to keeping chickens so any help or advice would be greatly appreciated.