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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 1940s, influenced by the studies of his former professor Edward C. Tolman, Tryon decided to test the theory that intelligence is an inherited trait. [2] To do this, he tested the ability of laboratory rats to navigate a maze: rats who took fewer wrong turns to get through the maze and reach the food at the end were termed "maze-bright", while those who took many wrong turns were termed ...
Rodents have been employed in biomedical experimentation from the 1650s. [1] Rodent studies up to the early 19th century were mainly physiological or toxicological.The first rodent behavioral study was carried out in 1822, a purely observational study [2], while quantitative rodent behavioral testing began in the late 19th century [1] [2].
Tyron's rat chart. Prior to Robert Tryon’s study of selective rat breeding, concluded in 1942, many psychologists believed that environmental, rather than genetic, differences produced individual behavioral variations. Tryon sought to demonstrate that genetic traits often did, in fact, contribute to behavior.
During his first tests, he placed around 32 to 56 rats in a 10-by-14-foot (3.0 m × 4.3 m) cage in a barn in Montgomery County. He separated the space into four rooms. Every room was specifically created to support a dozen matured brown Norwegian rats. Rats could maneuver between the rooms by using the ramps.
Image credits: bossnimrod89 In the U.S., during 2020, when adoption rates spiked, 2% more animals left shelters than arrived, according to Shelter Animals Count.However, by 2021, that figure ...
Selective breeding (also called artificial selection) is the process by which humans use animal breeding and plant breeding to selectively develop particular phenotypic traits (characteristics) by choosing which typically animal or plant males and females will sexually reproduce and have offspring together.
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