Animal biotechnology is the application of scientific and engineering principles to the processing or production of materials by animals to provide goods and services.Examples of animal biotechnology include generation of transgenic animals using gene knockout technology to generate animals in which a specific gene has been inactivated.Transgenic poultry, swine, goats, and cattle also have been produced that generate large quantities of human proteins in eggs, milk, blood, or urine, with the goal of using these products as human pharmaceuticals.Examples of human pharmaceutical proteins include enzymes, clotting factors, albumin, and antibodies.Animal biotechnology also can knock out or inactivate a specific gene.Knockout technology creates a possible source of replacement organs for humans.The process of transplanting cells, tissues, or organs from one species to another is referred to as "xenotransplantation".