I hope we could help these chicks know I have three chicky get it even Brahama gets it, I thought brahama is so tough . there is no swollen in hock, no pain.but my cochins and seilike look healthy their disease's symptoms are :- my chicks are about 5 weeks, low growing breed, most of them are mixed , brahama + sussex , brahama+ rhoad- irland .......... I give them soya- beans ,bread, oaths,Celery, mixed cereal , milding wheat , bird cereal ,ect ..multivit 1- at first day like to site down most of time and it seems standing for a long time hurt them. 2- second day they walk but sometime in back of knee and sometime right. 3- third day they don't use their toes of both foot and walk on their knees. 4- they drink, eat and even walk a little all the time the same level before they are sick. 5- they can't walk for a long distance.seems hurt them. 6- no swollen or red spot their legs look totaly healthy. 7- when you try to bring their toes to the right place seems there is no pain. most of these chicks growing so fast comparing to their breed growing.