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Chickens farmed primarily for eggs are called layer hens. The UK alone consumes more than 34 million eggs per day. [81] Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [82]
Heavy breed softfeather. The Australorp is a chicken breed of Australian origin, developed as a utility breed with a focus on egg laying and is famous for laying more than 300 eggs per year. It achieved world-wide popularity in the 1920s after the breed broke numerous world records for number of eggs laid and has been a popular breed in the ...
The only living mammals that lay eggs are echidnas and platypuses. In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them.
The RSPCA "Welfare standards for laying hens and pullets" indicates that the stocking rate must not exceed 1,000 birds per hectare (10 m 2 per hen) of range available and a minimum area of overhead shade/shelter of 8 m 2 per 1,000 hens must be provided. Free-range farming of egg-laying hens is increasing its share of the market.
In the early part of the twentieth century, it was one of the principal breeds kept for this purpose, until it was displaced by modern industrial hybrid lines. It may be kept as a dual-purpose bird. Hens lay some 180–200 tinted eggs per year; some layer strains may give up to 250. [7] The eggs weigh about 60 g. [9]
[20] [21] Generally, chicken breeds with white ear lobes lay white eggs, whereas chickens with red ear lobes lay brown eggs. [22] Although there is no significant link between shell color and nutritional value, often there is a cultural preference for one color over another (see § Color of eggshell below). As candling is less effective with ...
During the laying period, red junglefowl females lay an egg every day. Eggs take 21 days to develop. Chicks fledge in about 4 to 5 weeks, and at 12 weeks old they are chased out of the group by their mother — at which point they start a new group or join an existing one.
The Plymouth Rock is an American breed of domestic chicken. It was first seen in Massachusetts in the nineteenth century and for much of the early twentieth century was the most widely kept chicken breed in the United States. It is a dual-purpose bird, raised both for its meat and for its brown eggs. It is resistant to cold, easy to manage, and ...