The phrase "of veterinary medicine" refers to a field or profession related to the care, diagnosis and treatment of animals. This can include areas such as animal science, zoology, biology, anatomy, physiology, pharmacology, pathology, microbiology, parasitology, immunology, diagnostic imaging, surgery, theriogenology (reproduction), and public health aspects of veterinary medicine. It can also involve the study of specific animal species or groups of animals such as companion animals, livestock, horses, poultry, fish, wildlife, zoo animals, and laboratory animals.