no. If I understand it right, they were breed with the red sex link and RIR and leghorn in order to get them to produce as well as they do. Because of the fast growth and high production they don't live long ( in General ) and are prone to prolapse, and egg bound and a few other things I cant remember right off hand. But they are sweet hearts and they do start early producing.Are ISA Browns the same as red sex links just another name for them?