International Journal of Experimental Pathology. Archived from the original on 16 August Retrieved 17 February By contrast, outbred populations are used when identical genotypes are unnecessary or a population with genetic variation is required, and are usually referred to as stocks rather than strains. Over time, breeding the rats for these contests may have produced variations in color, notably the albino and hooded varieties. Small suggested that the rate of learning could be measured by rats in a maze; a suggestion employed by John B. See also: Hairless fancy rat.
Paloma. Age: 29.
The Long—Evans rat is an outbred rat developed by Drs.
Valerie. Age: 26.
Latina HoodratS .mp4
Biographical Memoirs of the National Academy of Sciences. This breed was developed at the Wistar Institute in for use in biological and medical research, and is notably the first rat developed to serve as a model organism at a time when laboratories primarily used the common house mouse Mus musculus. The albino laboratory rat with its red eyes and white fur is an iconic model organism for scientific research in a variety of fields.