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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.jstor.org/stable/1383241

tween litter sizes and numbers of mammae or fluctuating asymmetries in mam bers. Breeding female naked mole-rats can bear and successfully rear litters.

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.reproduction-online.org/content/6/2/205.full.pdf

Various factors concerned in the regulation of litter size and total reproductive ... litter size have been fairly extensively studied in rats and mice, although most.

academic.oup.com/jhered/article-pdf/49/6/303/2727680/49-6-303.pdf

SEX RATIOS AND LITTER SIZE IN THE. LABORATORY RAT. J. F. KlDWELL AND H. J. WEETH*. THE chromosome theory of sex de- termination leads to the ...

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 ...