I have only weighed the toulouse.
I would guess the brown chinese at weighing 12-14 pounds and the white chinese being a bit bigger at 14-16 pounds. The pieds tend to be right in the middle. Breeding season they are on laying mash, cracked corn, calcium, fruit and veggies and grazing. Flock raiser is no longer available near me. Summer time they Graze for 99% of their meals, they have 20 acres of grass to roam, fruit and veggies for treats. Winter time its cracked corn now with some grazing and fruit and veggies for treats.
My brother who ive told NOT to, likes to sneak them some bread every now and then as well. Since last summer He has cut back to once a week and and half a loaf between the entire flock. Ive had no problems from bread ever and i think its because they free range so much.
None are grossly Fat birds just solid