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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 ... females can only have up to 4 litters in a life time, and the litter size ...

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.nfrs.org/breedingpart1.html

Nov 26, 2012 ... Rats can have big litters of 14 or more and two rats can become 100 in ... to mount his own mother successfully due to the difference in size.

ratguide.com/breeding/basics/statistics.php

Nov 25, 2005 ... Gestation- 21-23 days; Weaning age- 21-28 days; Average litter size- 6-12 ( variable from 1-22); Average size of newborn- 6-7 grams; Fur on ...

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 ...