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Laboratory rats or lab rats are strains of the rat subspecies Rattus norvegicus domestica (Domestic Norwegian rat) which are bred and kept for scientific research. While less commonly used for research than laboratory mice , rats have served as an important animal model for research in psychology and biomedical science [ 1 ] , and "lab rat" is ...
In the U.S., the numbers of rats and mice used are not reported, but estimates range from around 11 million [4] to approximately 100 million. [5] In 2000, the Federal Research Division, Library of Congress, published the results of an analysis of its Rats/Mice/and Birds Database: Researchers, Breeders, Transporters, and Exhibitors.
Animal testing, also known as animal experimentation, animal research, and in vivo testing, is the use of non-human animals, such as model organisms, in experiments that seek to control the variables that affect the behavior or biological system under study. This approach can be contrasted with field studies in which animals are observed in ...
Climate change is contributing to a global rise in urban rat infestations, according to a new Science Advances study. As temperatures increase, rats are better able to thrive -- even in inclement ...
A knockout rat is a genetically engineered rat with a single gene turned off through a targeted mutation (gene trapping) used for academic and pharmaceutical research. Knockout rats can mimic human diseases and are important tools for studying gene function (functional genomics) and for drug discovery and development. The production of knockout ...
[3] [139] Albino mutant rats were first used for research in 1828 and later became the first animal domesticated for purely scientific purposes. [140] Nowadays, the house mouse is the most commonly used laboratory rodent, and in 1979 it was estimated that fifty million were used annually worldwide.
Individual rats would rarely eat except in the company of other rats. As a result extreme population densities developed in the pen adopted for eating, leaving the others with sparse populations. In the experiments in which the behavioral sink developed, infant mortality ran as high as 96 percent among the most disoriented groups in the population.
Tryon's Rat Experiment is a psychology experiment conducted by Robert Tryon in 1940 and published in the Yearbook of the National Society for Studies in Education. [ 1 ] Experiment set-up