Urban growth and biosecurity: The experimental farm of the Faculty of Food and Agriculture has two poultry houses with a capacity of about 15,000 birds. The farm was established more than twenty five years ago outside the city of Al-Ain in AbuDhabi Emirate. The city growth rate was vast enough to surround the originally isolate remote farm with houses. In 2002 the distance between the closest house and the farm was 630 m. This distance shrunk to 500, 360 and 300 m in 2003, 2005 and 2010, respectively.