Little background first before I get to the question. I had 8 chicks that I got middle of March as 4 week olds. They stayed initially in a 100 gallon stock tank and were outgrowing it and we finally got their 12 x 12 converted horse stall renovated about 2 weeks ago. We left the floor as dirt but had to bring in some fresh dirt we dug from places in our pasture (10 acres) to level it out. They are all supposed to be hens but 3 of them have gotten twice or more than the rest and rather aggressive in comparison. They still apear to be hens since the 3 have no definite red comb or wattle but the verdict will be out until laying or crowing. Anyway about a week ago, one died and then Saturday another did. The did not appear to be sick and neither do the remaining ones. But then again, I am a new chicken owner. BUT, I have stepped on the foot of one of the smallest and it is now walking with a limp and mostly just wants to lay down. It eats occassionally and I have tried to observe but have not seen her drink, maybe she has. She may indeed be sick if the others that died were but she does not appear sick. There is a thought by hubby and I that one of these aggressive chickens has killed the two that died but I just dont know. This little one is now separated from the others for rehab. I have read on here to give polyvisol baby vitamins without iron but am not sure how to give it. I am going after some at Walmart. Do I add to her water or do I give by dropperful. Any other advice would be most welcome. ETA - the little one that I have been hand feeding for the past 3 days is just the same this morning. She seems to protest a little more when I put the feed in her mouth so maybe a little more lively but still cant walk, just lays there. We went to church and came home to one of the remaining 5 laying in a corner. Was laying around a little more yesterday than the other 4 but I thought I was just worrying too much. Anyway, when I touched this one she fell over and just laid there unmoving, lifeless like. We culled her and buried her since there appeared no hope for her. Now I am frantic tho, they are dying about a week apart. I have now treated them all with Sulmet and added vitamin/eletrolyte to their water. What else can I do?