The NVI carries out the activities of the public veterinary service, which must be ensured by each member state of the European Union within the framework of a professional institution.

Institutes of the NVI
The laboratories of the Institute of Microbiology and Parasitology carry out diagnostics of infectious diseases of animals. They are equipped with state-of-the-art apparatus which is used to perform more than 280 microbiological methods.
The institute carries out educational and research work in the areas of food safety, feed, environment, animal welfare and hygiene.
It performs sampling, chemical, microbiological and microscopic analyses of food of animal origin and feed, olfactometric measurements (air analysis) and DDD.
As part of its activities, it provides technical, professional and scientific support to the Administration of the Republic of Slovenia for Food Safety, Veterinary and Plant Protection, as well as veterinarians, animal owners, breeders and producers of feed and food of animal origin. The institute also provides advice on the nutrition of cattle, small animals, horses, pigs, poultry and pets such as dogs, cats and exotic animals.
The unit of Pathology and Forensic and Veterinary Administration and the unit for the Healthcare and Breeding of Game, Bees and Aquaculture operate as part of the Institute of Pathology for Game, Fish and Bees.
The institute carries out veterinary morphology, genetics, biochemistry, physiology, pathophysiology, pharmacology and toxicology.
The clinic performs diagnosis, treatment and prevention of diseases of horses, cattle, sheep and pigs as well as diagnosis and treatment of fertility disorders and embryo transplantation. It keeps a central register of equidae and herd books and carries out tests of blood, urine and milk samples.
As part of various sub-units, the institute performs disease diagnostics and solves health problems in intensive breeding of poultry and in birds.