I have a young cockerel that is one of a group of 5 that I hatched out together in September. Unlike his siblings, he seems to have a terrible time with the cold snap we've had. I found him the other day on his side with his legs held out. I put him in a cage under a heat lamp and he came around fine and I was able to take him out when the temperature got above 32F. Today, while I was out doing errands, the temperature dropped again and he evidently had problems. I found him beneath the other four stretched out again. I put him in the brooder again and put a heat lamp on him and a younger chick who hatched out in October. The October chick is nowhere near as bothered by the cold as this one is. I am wondering if this bird is really too sensitive to the cold and should be culled. (I was planning on it once he was big enough for freezer camp). What can I do to get him over his cold problem? I'm feeding an 18% chick food to them. No signs of diarrhea or other issues.