How Do Rats Reproduce. The winter months may be too cold to allow for successful reproduction so rodents living outdoors may only be able to breed during the spring, summer and fall. Every litter can result in several pups.
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Once they find a conducive environment with plenty of food, water, and warmth, this will speed up further. Breeding and reproduction in rats can decrease because of factors such as age, malnutrition, abnormal light cycles, cold environment, cysts on the ovaries, tumors, and inadequate nesting material. During the breeding season, the female rats give off a hormone named pheromone, the same given off by other animals and insects living in packs.