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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.
The Silverudd Blue, Swedish: Silverudds Blå, is a Swedish breed of chicken. It was developed by Martin Silverudd in Småland, in southern Sweden. Hens lay blue/green eggs, weighing 50–65 grams. [1] The flock-book for the breed is kept by the Svenska Kulturhönsföreningen – the Swedish Cultural Hen Association. [2]
From 1930 it was raised in some 70% of the country. However, egg production was found to be variable, and birds did not adapt well to intensive management. Numbers declined; between 1961 and 1973 its percentage of the national chicken population fell from 11.4% to 1–2%. [4] Conservation efforts began in the 1970s. [4]
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.
The Sussex chicken is graceful with a long, broad, flat back; a long and straight breastbone; wide shoulders; and a rectangular build. The tail is held at a 45-degree angle from the body. The eyes are red in the darker varieties but orange in the lighter ones. The comb is single. The earlobes are red and the legs and skin white in every variety.
To figure out what causes the dreaded green ring and, more importantly, how to prevent it, we talked with Lisa Steele, a 5th-generation chicken keeper, founder of the Fresh Eggs Daily blog, author ...
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.