Animal Science involves study of the science and business of producing domestic livestock, such as beef and dairy cattle, swine, poultry, sheep and goats. An animal scientist applies principles of the biological, physical, and social sciences to the problems associated with livestock production, management, and welfare. Animal Science is also concerned with human food (meat, milk, eggs, etc.) produced from domesticated livestock species. The food processing industry is one of the largest industries in the U.S. In addition, Animal Science includes aspects of companion animals (horses, dogs, cats, etc.), including their nutrition, care, and welfare.