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Introduction  
     
     
  Broilers are hatched at a hatchery and transported as day-old chicks to specialised chicken producers. The chickens are reared on the floor of large stalls to the age of around 35-40 days and a live weight of 1.8–2.3 kg.  
     
     
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  Broiler lairage. Photograph: Anne Larsen, SLU.  
     
     
  Laying hens are hatched at a hatchery and reared by pullet rearers before being placed in laying hen barns at the age of approximately 16 weeks and begin to lay eggs soon afterwards. They lay almost one egg a day during the laying period. They are usually killed at the age of 70-95 weeks and replaced by a new group of hens.  
     
     
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