Yup--Cornish crosses. Sad day. This probably means that the rest of your white chickens will die too. :-( The CornishX aren't built to live long, just to get big really fast. The new chickens will be fine--the sales person probably got "Gold star" or "Golden sex-link" confused with the Cornish cross...Gold Stars/Red Stars/Gold sex links/Red sex links are all roughly the same breed of chicken and are excellent layers.