What Are Rabbits?

Rabbits (Oryctolagus cuniculus) are lagomorph mammals widely used as experimental subjects in biomedical engineering and life sciences research. The domestic rabbit, derived from the European wild rabbit, occupies a distinct phylogenetic position closer to humans than rodents, which makes it a valuable intermediate model for studies requiring anatomy and physiology that more closely approximate human systems. In the context of IEEE-adjacent research areas such as biomedical instrumentation, tissue engineering, and implantable device testing, rabbits serve as a key bridge between in vitro characterization and clinical trials.

The use of rabbits in laboratory settings is longstanding. New Zealand White rabbits became a standard research strain in the early twentieth century and remain the most common choice for preclinical device and material testing. Their docile temperament, manageable size (typically 2–5 kg), short reproductive cycles, and relatively modest housing costs make them practical for sustained experimental programs. As reviewed in a 2012 study published in the Dental Research Journal, rabbits as experimental models offer advantages in implant screening that are difficult to replicate with rodents alone.

Physiological Characteristics

The rabbit cardiovascular and respiratory systems share functional similarities with those of humans that are not present in mice or rats. Rabbits maintain a heart rate of approximately 200 beats per minute and a respiratory rate near 50 breaths per minute, with cardiac anatomy sufficient for catheterization and implantable device studies. Their lipoprotein metabolism responds to dietary cholesterol in a pattern resembling human atherosclerotic progression, a property that has made rabbits the primary model for cardiovascular plaque studies for decades. Bone microstructure, while differing from human cortical bone in remodeling kinetics, supports orthopedic implant testing at scales closer to clinical hardware dimensions than rodent bones allow.

Use in Implant and Device Testing

Regulatory pathways for implantable medical devices typically require in vivo biocompatibility data before human trials, and rabbits are among the approved species for ISO 10993 biological evaluation studies. Subcutaneous, intramuscular, and intraosseous implantation sites in the rabbit have well-characterized baseline tissue responses, enabling researchers to isolate material-specific reactions. Rabbit models are used to evaluate bone screws, dental implants, vascular grafts, drug-eluting coatings, and neural electrodes. The wide utility of rabbits as models of human diseases, reviewed in Experimental and Molecular Medicine, extends to vaccine testing, antibody production, and infectious disease research, including models for syphilis, tuberculosis, and norovirus.

Ethical and Practical Considerations

Animal research protocols involving rabbits fall under institutional animal care and use committee oversight and must comply with national regulations such as the U.S. Animal Welfare Act and European Directive 2010/63/EU. Rabbits are sensitive to handling stress, which can cause gastrointestinal stasis and confound experimental endpoints if pain management protocols are not rigorously followed. Anesthesia typically combines ketamine with xylazine, with depth monitored by pedal withdrawal reflex. The principles and applications of rabbit models in atherosclerosis research summarized in Arteriosclerosis, Thrombosis, and Vascular Biology provide a representative example of how experimental design, strain selection, and endpoint choice are formalized across a specific research domain.

Applications

Rabbits have applications in a wide range of disciplines, including:

• Preclinical testing of orthopedic and dental implants
• Cardiovascular device evaluation and atherosclerosis modeling
• Antibody production for immunoassay reagent development
• Ophthalmic research and corneal drug delivery studies
• Wound healing and tissue regeneration studies for biomedical engineering