I posted the picture of the big white chicken on here about 3 weeks ago and everyone helped me figure out it was a cornish x. There is brooder mate that I just assumed was a cornish x meat bird too. They are both 7 weeks old and it's big but not as big as the one we know is a meat bird. Can you tell me what I've got? Cornish x meat bird is on the left. Brooder sibling is on the right. I got both of these out of a straight run assorment. They are both 7 weeks old. Cornish X Brooder mate.