Animal Model Rats Related Ages with Human’s in Biomedical Research

The laboratory rat is an inevitable part of today's biomedical research. They arerecognized as the preeminent model in numerous fields, including neurobehavioralstudies, cancer and toxicology. It is difficult to evaluate the number of animalsemployed in scientific experiments every year. An estimation suggests some dozensof millions per year, being 15 million in the United States, 11 million in Europe, fivemillion in Japan, two million in Canada and less than one million in Australia.Almost 80% of the experimental animals are rodents that include mice, rats, guineapigs and others (10% are fish, amphibians, reptiles and birds). A third group includesrabbits, goats, bulls and in smaller amounts, dogs, cats and some species ofprimatess.