I will try to make a long story short. I have 25 chicks, and at 15 days one exhibited sickly-like behavior by not standing well, tipping over, feathers puffed out, and acting cold. It was all the typical signs for Marek's disease. I fed it polyvisol infant vitamins, and scrambled eggs (I had to force feed it), and it got so sick that it's like it's legs were paralyzed. It could move it's legs, but it could not sit on them or stand on them. So it just layed there with it's legs to the side. In the meantime, I had two more chicks start with the same symptoms. I was so upset thinking I might have Marek's when I'd never had a problem with chicks before. I was about to kill the chick and take it in for a necropsy when a friend suggest I look up vitamin e deficiency. I did, and the symptoms were all the same. So I started treating with vitamin e yesterday. I forgot to pick up selenium today, so I don't have that. The chick that is doing so poorly (I really don't know how it's still alive) has just the slightest improvement, and the other two have a little improvement as well (but certainly not 100%). I have switched all the chicks' feed, and I am giving everyone polyvisol via their water. I don't know why the feed would be bad, I buy it from a reputable feed store, and it has all the right ingredients for chick formula including vitamin e and selenium. BUT I HAVE NO IDEA HOW MUCH VITAMIN E I SHOULD BE GIVING THE SICK CHICKS OR HOW OFTEN! I cannot find anywhere a good read on what exactly I should be doing to treat a severe vitamin deficiency in my chicks, especially the sick ones. I don't even understand why they would have this. Could it be from the parent stock not having a balance diet? I am not even 100% sure this is the problem, but it feels right. I also found that Marek's really doesn't show up until 3 weeks, and my chick was barely 2 weeks when it started acting poorly. Also, the breeder I got them from is tested twice yearly for NPIP certification including Marek's disease. Interestingly, vitamin deficiencies start to appear at day 15, exactly what my chick was. ANY information would be extremely helpful as I have found all the info to make a diagnosis, but barely any info on how to solve the problem. THANKS!