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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 ...
Older hens gradually produce fewer eggs, and the eggs are usually larger. [1] Since the average lifespan of a pet layer hen is 8–15 years, [2] henopause has received attention as a potential problem for backyard or urban chicken farmers who are eventually faced with the decision to either slaughter older layers or keep them as non-producing pets.
Commercial hens usually begin laying eggs at 16–20 weeks of age, although production gradually declines soon after from approximately 25 weeks of age. [2] This means that in many countries, by approximately 72 weeks of age, flocks are considered economically unviable and are slaughtered after approximately 12 months of egg production, [3] although chickens will naturally live for 6 or more ...
For chickens that lay blue eggs, a pigment protein called oocyan is added when the eggshell is built, creating a blue shade, he says. ... which may be dictated by the age of the hen. “Brown eggs ...
The Lohmann Brown is a brown variety of chicken, specifically bred for egg-laying purposes. It is a crossbred line [1] and is selectively bred from lines of the Rhode Island breed. [2] They start to lay eggs at about 19 weeks and produce up to 320 eggs up to an age of 72 weeks (one year production).
Chickens are common and widespread domestic animals, with a total population of 26.5 billion as of 2023, and an annual production of more than 50 billion birds. A hen bred for laying can produce over 300 eggs per year. There are numerous cultural references to chickens in folklore, religion, and literature.
The Gramapriya starts laying eggs at an age of 175 days. In 72 weeks a Gramapriya chicken can lay 200–225. [2] [3] Gramapriya is a crossbred chicken developed by the Indian Government through a Hyderabad-based project under an All India Co-ordinated Research Project. Gramapriya chickens have been developed for backyard rearing.
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]