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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.
As the country's main egg producer installed in-ovo sexing technology installed in summer 2023, [96] its first no-kill eggs entering shops in 2024, [96] and its only competitor unveiled plans to open a new no-kill hatchery in autumn 2024 as well, [97] it was expected as of April 2024 that the Norwegian government would adopt a national ban on ...
Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [86] After 12 months of laying, the commercial hen's egg-laying ability declines to the point where the flock is commercially unviable. Hens, particularly from battery cage systems, are sometimes infirm or have lost a ...
A study of female greater prairie-chickens in Kansas found that their survival rates were 1.6 to 2.0 times higher during the non-breeding season compared to the breeding season; this was due to heavy predation during nesting and brood-rearing. [28] One problem facing prairie-chickens is competition with the ring-necked pheasants. Pheasants lay ...
Forced molting typically involves the removal of food and/or water from poultry for an extended period of time to reinvigorate egg-laying. Forced molting, sometimes known as induced molting, is the practice by some poultry industries of artificially provoking a flock to molt simultaneously, typically by withdrawing food for 7–14 days and sometimes also withdrawing water for an extended period.
[40] [41] Since the mid-20th century the London market for wild bird eggs has largely been filled by the eggs of the black-headed gull, in large part because the market is haunted by the ghost of plover's eggs. [6] [42] Black-headed gulls' eggs have long been collected off the marshlands of Northumberland. [23]
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[9] [4] [10] [11] It has been suggested that the actions of a protein found in modern chicken eggs may make the answer different. [10] [11] In the uterus, chickens produce ovocleidin-17 (OC-17), which causes the formation of the thickened calcium carbonate shell around their eggs. Because OC-17 is expressed by the hen and not the egg, the bird ...