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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]
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 ] It was initially known by various names including Isbar, Blue Isbar and Svensk Grönvärpare , or "Swedish green egg layer"; in 2016 it was renamed to 'Silverudd Blue ...
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 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.
More than 145 million chickens, turkeys and other birds have been slaughtered since the current outbreak began, with the vast majority of them being egg-laying chickens. Cage-free egg laws in 10 ...
The theory gained steam on Facebook, TikTok and Twitter in recent weeks, with some users reporting that their hens stopped laying eggs and speculating that common chicken feed products were the cause.