Rats are used extensively in research because they share approximately 95% of their DNA with humans and exhibit similar physiological and behavioral responses to various stimuli. This biological similarity makes them valuable models for understanding how diseases develop and how potential treatments might work in humans before clinical trials.
Rats also offer practical advantages: they are small, inexpensive to house and breed, have relatively short lifespans (allowing researchers to study generational effects), and reproduce quickly, enabling large-scale studies. Their nervous systems are sufficiently complex to model human brain function and neurological diseases, yet simple enough to study in detail.
Specific applications include testing new medications for safety and efficacy, studying cancer and tumor development, researching neurological conditions like Parkinson's and Alzheimer's, investigating addiction and behavioral responses, and understanding aging. Rats have been instrumental in developing treatments for diabetes, heart disease, and psychiatric disorders.
The use of animal models like rats is considered more ethical and practical than testing directly on humans at early stages of research. Regulatory agencies typically require animal studies before human trials are permitted. Many research institutions follow strict ethical guidelines regarding animal care and use, including the principle of using the minimum number of animals necessary and focusing on reducing animal suffering through anesthesia and appropriate handling protocols.