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The blue egg of the Araucana was at this time thought to be unique among chickens. In 1933 Reginald Punnett showed that the blue egg ("oocyan") gene in chickens is dominant with respect to white, while in combination with genes for brown eggs, various shades of green and olive are produced.
Pullets in the three possible colours. The Silverudd Blue is a medium-sized chicken. Hens weigh approximately 1.5 kg, and cock birds about 2.5 kg. [1]As in other blue chicken breeds, three colours occur in accordance with the frequency of the dilution gene: black, blue and splashed white, in Mendelian proportion (1:2:1).
The Ameraucana is an American breed of domestic chicken. It was developed in the United States in the 1970s, and derives from Araucana chickens brought from Chile. It was bred to retain the blue-egg gene but eliminate the lethal alleles of the parent breed. There are both standard-sized and bantam versions. [2]
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]
Sex-links come in several varieties. As hybrids of laying or dual-purpose breeds infused with extra vigor via heterosis, sex-links can be extremely good egg-layers which often produce 300 eggs a year or more depending on the quality of care and feed. The color of their eggs vary according to the mix of breeds, and blue-green eggs are possible.
A 7-week-old cream pullet. The Legbar has three colour varieties: gold, silver and cream. [15] The cream variant has a crest and lays blue, olive or green eggs. [11]: 53 The Legbar is considered a rare breed by the Poultry Club of Great Britain and, until the Autosexing Breeds Association was re-formed, fell under the Rare Poultry Society.
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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.