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Commercial chicken production for the supply of meat and eggs has expanded in the scale and variety of production systems in use to facilitate the supply of a range of cost-effective products in response to consumer demand. In the egg sector, traditional cage systems were required to be replaced in the EU by 2012, and most of this production capacity has been replaced by colony cage systems, which provide more space, perching, and environmental enrichment. In some countries there is significant production of “cage-free” or “barn” eggs in which the birds remain housed, but have access to litter. In the UK most egg production is now free-range. Meat poultry is produced in “barn” systems with various enrichments and some free-range. The rise in free-range production has seen the return of some diseases. Biosecurity is a critical tool for disease control in all production systems, particularly when disease challenge is high or farms are in a high poultry density area. An infectious dose of a pathogen is important in determining outcomes in terms of health and productivity, so biosecurity, hygiene, and good management are important across many diseases. Infections which are notifiable, of zoonotic importance and those which are sporadic or endemic in commercial poultry production are reviewed. General principles of preventative medicine applicable to the control of infectious diseases in different poultry production systems are proposed in areas such as biosecurity, system design and maintenance, range, and vaccination, though good management is always important.

Infectious diseases in free-range compared to conventional poultry production