Animal welfare refers to respecting the rights of animals, protecting the ecological environment and promoting the coordinated development of human and animals; Environmental welfare, i.e. providing animals with appropriate accommodation; Health and welfare, i.e. to minimize animal injuries; Behavioral welfare, that is, to ensure the freedom of animals to express their nature; Psychological welfare, that is to reduce animal fear and anxiety.
According to the above definition, which of the followings does not involve animal welfare??
Chicken farms allow hens to forage freely in the mountains and forests to improve the egg laying rate