After giving birth, female Norway and roof rats are capable of being in heat again in 24 to 48 hours. Norway and roof rats live approximately one year. The young mouse can be sexually mature and capable of mating in as little as 5 weeks. The female can still be lactating her young and be pregnant with a new litter, although the gestation period might be slightly longer. A female will have an average of 8 litters per year, with each litter averaging 5 to 6 pups.
Mice live approximately one year.
Bromethalin and zinc phosphide are two examples of acute baits that are occasionally used for clean-outs. Most rodent control professionals, however, prefer anticoagulants. These rodenticides inhibit the blood's clotting mechanism, causing rodents to die from internal bleeding. After you've identified where a rodent problem exists, place a rodenticide where it can do the most good. Each application is unique.