Both intensive and free-range farming have animal welfare concerns. In intensive systems, cannibalism, feather pecking and vent pecking can be common, with some farmers using beak trimming as a preventative measure. Diseases can also be common and spread rapidly through the flock. In extensive systems, <answer>the birds are exposed to adverse weather conditions and are vulnerable to predators and disease-carrying wild birds.</answer> Barn systems have been found to have the worst bird welfare. In Southeast Asia, a lack of disease control in free-range farming has been associated with outbreaks of avian influenza.
What are some of the major concerns with extensive breeding programs such as free range ?
the birds are exposed to adverse weather conditions and are vulnerable to predators and disease-carrying wild birds.