Okay so right now I'm not sure why but a AlReady 3 of my chickens have died and another one I think will. One was a 3 month old polish. The other two were 2 month old serama/polish mixes. They are still with their mom in a slightly heated building. Like in the 60's. All the chickens got really weak and were all fluffed up all the time. And got really skinny. With all of them they seemed completely fine until about 12-24 hours before they died, so i had no warning. None of my other chickens have lost any weight and still feel pretty meaty when I hold them. Now Im really freaked out because the momma hen has her neck really crooked and the right side of her face is tilted towards the sky. Her left eye is closed, with no clear injuries, it's just closed. She's walking around with her neck crooked. I felt her neck and I don't think it was broken or anything. Also, she had a straight neck yesterday, then i checked on her a few hours ago and it was crooked. She can still eat and drink and stand, just off balance if i gently push her. Does anybody know what this is? Also, reading online most websites day its a vitamin deficiency, I have been feeding her chick feed for the past couple months since she's with her chicks, could it be because of this?