Accorging to FDA's opinion, GE animals currently being developed can be divided into six broad classes based on the intended purpose of the genetic modification:
- to enhance food quality or agronomic traits (e.g., pigs with less environmentally deleterious wastes, faster growing fish);
- to improve animal health (e.g., disease resistance);
- to produce products intended for human therapeutic use (e.g., pharmaceutical products or tissues for transplantation; these GE animals are sometimes referred to as “biopharm” animals);
- to enrich or enhance the animals’ interactions with humans (e.g., hypo-allergenic pets);
- to develop animal models for human diseases (e.g., pigs as models for cardiovascular diseases); and
- to produce industrial or consumer products (e.g., fibers for multiple uses).