Book excerpt: Animal welfare has been a subject of intellectual and academic study for a long time. In the past philosophers, thought-leaders and scientists have contributed to the debate, and seismic changes such as the advent of post-war industrial farming have brought about changes in attitudes to the way animals are farmed. Animal welfare as a science and philosophy can be understood as a trajectory through history of our understanding of our relationship with animals, enhanced in recent years through studies into animal behaviour and cognition and societal changes in the way we view animals. --From back cover.