Genetically modified mammal
Genetically modified mammals are mammals that have been genetically engineered. They are an important category of genetically modified organisms. The majority of research involving genetically modified mammals involves mice with attempts to produce knockout animals in other mammalian species limited by the inability to derive and stably culture embryonic stem cells.
The majority of genetically modified mammals are used in research to investigate changes in phenotype when specific genes are altered. This can be used to discover the function of an unknown gene, any genetic interactions that occur or where the gene is expressed. Genetic modification can also produce mammals that are susceptible to certain compounds or stresses for testing in biomedical research. Some genetically modified mammals are used as models of human diseases and potential treatments and cures can first be tested on them. Other mammals have been engineered with the aim of potentially increasing their use to medicine and industry. These possibilities include pigs expressing human antigens aiming to increasing the success of xenotransplantation to lactating mammals expressing useful proteins in their milk.
Genetically modified mice 
Genetically modified mice are often used to study cellular and tissue-specific responses to disease (cf knockout mouse). This is possible since mice can be created with the same mutations that occur in human genetic disorders, the production of the human disease in these mice then allows treatments to be tested.
The oncomouse is a type of laboratory mouse that has been genetically modified developed by Philip Leder and Timothy A. Stewart of Harvard University to carry a specific gene called an activated oncogene.
Metabolic supermice are the creation of a team of American scientists led by Richard Hanson, professor of biochemistry at Case Western Reserve University at Cleveland, Ohio. The aim of the research was to gain a greater understanding of the PEPCK-C enzyme, which is present mainly in the liver and kidneys.
Genetically modified rats 
Genetically modified goats 
BioSteel is a trademark name for a high-strength based fiber material made of the recombinant spider silk-like protein extracted from the milk of transgenic goats, made by Nexia Biotechnologies. The company has successfully generated distinct lines of goats that produce in their milk recombinant versions of either the MaSpI or MaSpII dragline silk proteins, respectively. Nexia Biotechnologies, however, went bankrupt and is no longer company.
Genetically modified pigs 
The enviropig is the trademark for a genetically modified line of Yorkshire pigs with the capability to digest plant phosphorus more efficiently than ordinary unmodified pigs that was developed at the University of Guelph. Enviropigs produce the enzyme phytase in the salivary glands that is secreted in the saliva.
In 2006 the scientists from National Taiwan University's Department of Animal Science and Technology managed to breed three green-glowing pigs using green fluorescent protein. Fluorescent pigs can be used to study human organ transplants, regenerating ocular photoreceptor cells, neuronal cells in the brain, regenerative medicine via stem cells, tissue engineering, and other diseases.
Genetically modified cattle 
Genetically modified dogs 
Ruppy (short for Ruby Puppy) was in 2009 the world's first Genetically modified dog. A cloned beagle, Ruppy and four other beagles produced a fluorescent protein that glowed red upon excitation with ultraviolet light. It was hoped to use this procedure to investigate the effect of the hormone oestrogen on fertility.
Genetically modified primates 
In 2009 scientists in Japan announced that they had successfully transferred a gene into a primate species (marmosets) and produced a stable line of breeding transgenic primates for the first time. It is hoped that this will aid research into human diseases that cannot be studied in mice, for example Huntington's disease and strokes.
Genetically modified cats 
In 2011 a Japanese-American Team created genetically modified green-fluorescent cats in order to find therapies for HIV/AIDS and other diseases as Feline immunodeficiency virus (FIV) is related to HIV.
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