What is this big fat chicken?

[Peep Nerd]

She came in a mixed bunch from McMurray Hatchery last fall. She is twice the size of my red sex links and has some darker markings around her neck and in her tail. Anyone?

 

[Veer67]

She looks like the "Pioneer" chickens that Murray McMurray hatchery holds. So, she is basically a mix of breeds. Probably with some Rhode Island Red.