Last week I purchased 12 day old chicks from my local feed store. One of them wasn't growing as fast as the others and kept getting paste butt. When I checked on them yesterday evening she was dead. I figured it was some kind of intestinal abnormality and wasn't worried about it. However, this morning two more chicks have paste butt who didn't have it before. I've raised chicks for three previous years and never had this problem. This year though I'm raising them in a barn instead of in the house and I've added sav-a-chick electrolytes to their water. I'm not sure if one of these things could be contributing to my problem or if it's something contagious. Help and advise is welcome.