National Animal Identification System hold one or more heads of livestock including horses, cattle, sheep, goats, pigs, deer and camels, though the NLIS will not confirm ownership of livestock. The system originates from a cattle-tracing system introduced in Australia in the 1960s to help fight bovine tuberculosis. The Australian system has over 11,000,000 phantom livestock in the system that do not exist. This system costs farmers money because of the increased handling time and lost margins when tags do not match in the system resulting in lower payments to farmers. New Zealand is planning a similar National Animal Identification and Tracing system. National Animal
Animal studies and to understand animals as beings-in-themselves, separate from our knowledge of them. Because the field is still developing, scholars and others have some freedom to define their own criteria about what issues may structure the field. As an interdisciplinary subject, animal studies exists at the intersection of a number of different fields of study. Different fields began to turn to animals as an important topic at different times and for various reasons, and these separate disciplinary histories shape how scholars approach animal studies. In part, animal studies developed out of the animal liberation movement and was grounded in ethical questions