I got 3 hens at the age of 3 months. Kept them separate from the older ones for months and was feeding everyone the same thing. At age 6 months I turned all the hens out into the yard to free range and so they could all become acquainted. Everything seemed fine for the longest time up until a month ago when my youngest started showing signs of paralysis. I had no idea what I was dealing with and began to research. Finding Marek's Disease I though for sure this was it. Then her brood mate came down with paralysis and I'm going OMG! I finally made an appt to see the vet. Unfortunately the first hen had died that night. They sent the hen's body for a necropsy and these were the results: IT WAS NOT MAREK'S!! That's the good news. Results showed visceral renal gout and uric acid (this is what was causing their paralysis) http://www.lorikeets.com/gout.htm , high levels of Vitamin D and calcium and toxicum levels. Apparently we can only figure that their feed was the cause. I got them started on layer feed way too soon. I had no idea this would happen. I only wish now that I knew better and it would not have caused the lose of 2 little hens. I only hope this helps out any others that may be experiencing this problem or wondering what to feed those teenage chicks or when to get them started on layer feed. Good luck. Thanks. Another article on gout: http://www.hyline.com/redbook/Health/Gout.html To live, to learn, to live and learn.