Poultry records 1986
>"Guinness Book of World Records" 1986 special edition ,hardcover Page 58
>The heaviest breed of chicken is the white sully developed by Grant
>Sullens Of West point California over a period of 7 years by
>crossing and recrossing large Rhode Island reds .One monstrous
>rooster named "Weirdo" reportedly weighed 22lbs in Jan 1973 , and
>was so ferocious that he crippled a dog which came to close and
>killed 2 cats .
>The greatest dressed weight for a turkey (Meleagris gallapavo) is 78
>lb 14 1/4
>ounces for a stag reared by Dale Turkeys of Shropshire , England .
>It won the annual heaviest turkey competition held in London Dec.15
So if you want to breed the tallest birds cross and recross the same breed selcting for the tallest for each of the tallest breeds then if you want to start a new breed ,cross the breeds together and select again until you can go no further . :rolleyes:
as far as size goes hamburgs are suposed to have roos that weigh 13 pounds .
As far as meaness goes ; some chickens are still bred for cock fights in some countries .
there is no ONE chicken that makes all other obsolete .