Email me when this is Available. Light Brahma Chicken The standard breed of Brahma Chickens is a heavy bird named for the Brahmaputra River in India, the Brahma is thought to have developed by certain crossings of other Asiaticlike the Chinese Shanghai, commonly known as Cochin Chicken, and the Chittagong Chicken. massive breed, the Brahma roosters can get up to 12 pounds and the standard hens weight is around 9.5 pounds. Though the breed is slow to mature, it is a good layer of medium brown eggs and is extremely hardy in hot and cold conditions.