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  2. Henopause - Wikipedia

    en.wikipedia.org/wiki/Henopause

    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.

  3. Intensive animal farming - Wikipedia

    en.wikipedia.org/wiki/Intensive_animal_farming

    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. In Europe, they are generally butchered after a single season. The laying period begins when the hen is about 18–20 weeks old (depending on breed and season).

  4. Super-chicken model - Wikipedia

    en.wikipedia.org/wiki/Super-chicken_model

    He grouped average egg laying chickens together. And he grouped together a prolific egg laying flock: he called these "super chickens". Muir kept these chickens in their groups for two generations and he found that the average chickens were doing fine and they consistently produced eggs. In the super chickens group, Muir found that only three ...

  5. Organic egg production - Wikipedia

    en.wikipedia.org/wiki/Organic_egg_production

    Organic egg production is the production of eggs through organic means. In this process, the poultry are fed organic feed. In this process, the poultry are fed organic feed. According to the United States Department of Agriculture, organic means that the laying hens must have access to the outdoors and cannot be raised in cages. [ 1 ]

  6. Battery cage - Wikipedia

    en.wikipedia.org/wiki/Battery_cage

    In February 2016, 90 percent of egg-laying hens in Canada lived in battery cages. That month, negotiations between egg farmers, animal welfarists, and the government resulted in a moratorium on construction of new battery cages from 1 April 2017 and a gradual 15-year phaseout of battery cages towards enriched cage or cage-free systems by 2036 ...

  7. Animal husbandry - Wikipedia

    en.wikipedia.org/wiki/Animal_husbandry

    The great majority of laying birds used for egg production are chickens. Methods for keeping layers range from free-range systems, where the birds can roam as they will but are housed at night for their own protection, through semi-intensive systems where they are housed in barns and have perches, litter and some freedom of movement, to ...

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  9. Broiler industry - Wikipedia

    en.wikipedia.org/wiki/Broiler_industry

    Depending on breed, egg production starts at 24–26 weeks of age. Production percentage (daily eggs per hen) climbs rapidly to a peak of 80–85% at 29–32 weeks, and then gradually declines with age. Hatchability tends to peak (at perhaps 90%) somewhat later than production at 34–36 weeks. [20]