Layer breeding programmes in changing production environments: a historic perspective

@article{Leenstra2016LayerBP,
  title={Layer breeding programmes in changing production environments: a historic perspective},
  author={Ferry Leenstra and Jan ten Napel and Jeroen Visscher and F van Sambeek},
  journal={World's Poultry Science Journal},
  year={2016},
  volume={72},
  pages={21 - 36}
}
The housing and management of laying hens and their productivity has gone through enormous developments in the last century. Housing has changed from free-range systems, via battery cages to a variety of loose housing and different types of battery cages, and back to outdoor access systems. Although battery cages are still the main system used worldwide, the number of hens housed in aviaries and free-range systems has increased in Europe, Australasia and some parts of the USA, but aviaries and… 

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