Rats are currently the small model species physiologically closest to humans. This characteristic, together with recent advances in genetic manipulation and the ease of surgery due to its large size (a rat is 10 times larger than the mouse), make the rat a very attractive model. It is commonly used for the study of numerous human pathologies, as well as for the discovery of new therapeutic targets and molecules.
Breeding season: all year round
Gestation time: 21 to 23 days
Physiological weaning: about 4 weeks
Social withdrawal: 5 to 6 weeks
Breeding age: males 5 to 7 weeks, females 4 to 10 weeks old.
Number of offspring: 7 to 14 pups per litter (on average)
Number of litters per year: 6 to 8