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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.
In American usage, an Easter egger or Easter-egger is any hybrid or mixed-breed chicken resulting from the breeding of a bird carrying the blue egg (oocyan) gene with one that lays brown eggs. Eggs from such a bird may be any shade of blue or brown, [ 1 ] : 175 or occasionally pink or pale yellow. [ 2 ]
Illustration of thirty-nine varieties of chicken (and one Guinea Fowl) . There are hundreds of chicken breeds in existence. [1] Domesticated for thousands of years, distinguishable breeds of chicken have been present since the combined factors of geographical isolation and selection for desired characteristics created regional types with distinct physical and behavioral traits passed on to ...
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]
Green iridescence is desired for "beetle black" show chickens. Blue Sumatra dark blue-laced Andalusian Splash or Blue Splashed White Sumatra Silkie Splash is the homozygous form of Blue Buff Lavender: Red lavender Red Red is the intensified version of Buff White: Silkie
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).
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.
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.