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The Plymouth Rock was included in the first edition of the American Standard of Perfection of the new American Poultry Association in 1874. [2] The barred plumage pattern was the original one; other colors were later added. [2] It became the most widespread chicken breed in the United States and remained so until about the time of World War II. [2]
Size Pack weight (12 eggs) Mass range per egg Average mass per egg Edible portion per egg King-size 860 g 71.7 g – 78.5 g 73 g 64 g Jumbo 800 g 66.7 g – 71.6 g 68 g 59 g Extra-Large 700 g 58.3 g – 66.6 g 60 g 52 g Large 600 g 50.0 g – 58.2 g 52 g 45 g Medium 500 g 41.7 g – 49.9 g 43 g 37 g
Varieties: White and Barred; Purpose: Dual (egg and meat) Egg Size / Color: Medium / White; Skin Color: Yellow; Standard Weights: Cock - 8½lbs; Hen - 6½lbs; Cockerel - 7½lbs; Pullet - 5½lbs; There is also a bantam version of the breed.
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The chicken breeds recognized by the American Poultry Association are listed in the American Standard of Perfection. They are categorized into classes: standard-sized breeds are grouped by type or by place of origin, while bantam breeds are classified according to type or physical characteristics .
The physical traits used to distinguish chicken breeds are size, plumage color, comb type, skin color, number of toes, amount of feathering, egg color, and place of origin. [1] They are also roughly divided by primary use, whether for eggs, meat, or ornamental purposes, and with some considered to be dual-purpose. [1]
Vent sexing in Wenchang, Hainan, China (2014). Vent sexing, also known simply as venting, involves squeezing the feces out of the chick, which opens up the chick's anal vent (called a cloaca) slightly, allowing the chicken sexer to see if the chick has a small "bump", which would indicate that the chick is a male.