The Jersey Giants take the prize for largest breed.
Here are some factoids:
Standard Weights: Cock-13 pounds; hen-10 pounds; cockerel-11 pounds; pullet-8 pounds.
The Jersey Giant was developed in the 1870's in New Jersey to meet the demand for heavy fowl.
It was originally called the Jersey Black Giant, named after the Black brothers, who first developed it.
Giants were bred from crosses of Orpingtons, Javas, and Langshans,
Jersey Giants, come in black and a grey, referred to as white.
There have also been buff, all white and blue, but none of these have taken hold.
They are in the American Class, according to the Standard and are the largest chicken developed in America.
They are rugged, because they grow a large frame first.
Their tendency is to grow the skeletal frame first, then put on the flesh - starting at about 6 mos.
They are a poor fit for today's modern poultry-industry, since the poultry biz prizes a rapidly fleshing-out bird.
Jersey Giants have an angular shape, single comb and black (with willowish tinge) shanks in the Black variety.
The Jersey Giant hen will go broody, but is not the best choice for incubating and brooding because of her size.
They used to be more widespread, but their popularity has waned.
No fowl with black plumage or dark shanks has ever remained popular in this country for long.
Jersey Giants have been known to chase off coyotes.
They lay brown eggs.
Other large breeds to consider are the Langshan, Cochin and Brahma, all in the Asiatic class. The Brahma was the preferred market meat-bird in this country, prior to the 20th century.
I can only wonder how big Jersey Giant capon would grow. C'mon Thanksgiving. Turkeys... move over!