Can't stand up/ losing balence

Your little cockerel looks like he could possibly have Mareks disease or some other neurological problem that is affecting his balance. Are one of his legs paralyzed? Do the toes on either foot curl at times or all of the time? Does he walk or sit on his hocks or elbows? Mareks disease has 4 different types, and the symptoms can vary with each chicken. It can cause eye problems, skin problems, internal tumors, or paralysis, but the same chicken may only show 1 or 2 of these. I certainly hope that it isn't Mareks, so I would look at poisoning or vitamin deficiency as possible causes. In the meantime, I would start some poultry vitamins in the chicken's water. There are some decent brands at feed stores and online. Avian Super Pack 1/4 tsp per 5 gallons of water is one found here: http://www.randallburkey.com/Avian-Super-Pack_ASP-4-oz/productinfo/26094/#.U-j1uPldVWN

Here are some links on Mareks:
http://extension.unh.edu/resources/files/Resource000791_Rep813.pdf
http://partnersah.vet.cornell.edu/avian-atlas/search/disease/502
https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq

 

he may have tore a tendon also. but i would try to make a leg brace for him out of wire and see what happens if not you may have to put him down sorry.