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en.wikipedia.org/wiki/Brown_rat

The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, .... Females are able to produce and raise two healthy litters of normal size and weight without significantly changing their own food intake. However ...

www.peteducation.com/article.cfm?aid=889

In rats, the average litter size is 6-13 pups. The first sign is a bloody discharge from the vagina. Next, the contractions will cause her to stretch out while her sides ...

www.afrma.org/brdstf_lrglttrs.htm

What is the normal litter size for rats? Do they always have this many?! Is the mother rat going to be able to care for 16 babies? What will I need to do for her?

discovermagazine.com/2006/dec/20-things-rats

Dec 7, 2006 ... Jack Black the royal rat catcher, Jacko the world-champion rat killer, rats who mate more than once a minute, and more.

www.animalhospitals-usa.com/small-pets/mice-and-rats/mice-rat-reproduction.html

Sexing: Sexually mature mice and rats must be properly paired to breed ... Litter sizes average 10-12 pups, though it is not unusual for a female's first litter to be ...

www.ncbi.nlm.nih.gov/pubmed/17089989

J Am Assoc Lab Anim Sci. 2006 Nov;45(6):35-9. Fenbendazole treatment and litter size in rats. Johnston NA(1), Bieszczak JR, Verhulst S, Disney KE, ...

www.ncbi.nlm.nih.gov/pubmed/1463926

Reprod Toxicol. 1992;6(5):453-6. Relationship between fetal weight and litter size in rats: application to reproductive toxicology studies. Romero A(1), Villamayor ...

www.knockoutpcs.co.uk/pests/brown-rat.asp

The brown rat can be found native through out the UK and tends to be heavily ... The litter size does vary but an average litter size is 8 with approximately 6 litters  ...

www.victorpest.com/advice/rodent-library/norway-rats

Reproduction of the Norway Rat. Litter Size: 8-12 pups per litter. No. of Litters: 4-7 per year. Sexual Maturity: 2-3 months. Gestation Period: 22 days. Breeding ...

www.quora.com/How-many-babies-do-rats-have-per-litter-How-many-litters-can-they-have-in-a-year

11 in a litter. The gestation period is something crazy like 28 days (maybe longer it's been a ... Rats have 12 nipples, and I believe the average litter size is 8 to 10 young. Of course, this is only an average and can vary. I have owned rat that ...