No one has ever bred a chicken with a different bird. The genetic engineering of chickens, which had already taken place by the periods referred to in the Talmuds, was done through natural means (preferring those that lay eggs even when infertile, and eating the rest).
Please list the Hechksherim giving heckshers to unprocessed chicken eggs, and the companies producing them. I can’t seem to find them in any kashrus guides, leading me to think discussion is a HOAX (probably be a non-frum Jews trying to annoy us).