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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
The dual-purpose chicken selected by the Lohmann group, the “Lohmann Dual”, [50] is raised in Switzerland by a few breeders, and the Coop network decided to launch the experiment with a test on 5,000 poultry, although knowing that instead of producing up to 300 eggs per year like very good laying hens, it will only produce around 250 eggs ...
Hens and other egg-laying creatures are raised throughout the world, and mass production of chicken eggs is a global industry. In 2009, an estimated 62.1 million metric tons of eggs were produced worldwide from a total laying flock of approximately 6.4 billion hens. [3]
But what about egg-laying birds, like the chicken? As it turns out, about 60% of chicken genes have a human gene counterpart. BI GRAPHICS_percentage of DNA humans share with other things_chicken.
On average, a chicken lays one egg a day, but not on every day of the year. This varies with the breed and time of year. In 1900, average egg production was 83 eggs per hen per year. In 2000, it was well over 300. In the United States, laying hens are butchered after their second egg laying season.
Eggs were a farm operation where even small children could make a valuable contribution. [23] In 2015, the national flock suffered due to the spread of bird flu, affecting birds in fourteen states, leading to layoffs. [24] A May 2015 report by the Associated Press reported that 10% of egg laying chickens were dead or dying due to bird flu. [25]
Chickens farmed primarily for eggs are called layer hens. The UK alone consumes more than 34 million eggs per day. [84] Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [85]
As is the case with chickens, various breeds have been developed, selected for egg-laying ability, fast growth, and a well-covered carcase. The most common commercial breed in the United Kingdom and the United States is the Pekin duck, which can lay 200 eggs a year and can reach a weight of 3.5 kg (7 lb 11 oz) in 44 days. [34]