Sexing Furry Critters

Grace Sonnentag

Gerbils

Female gerbils sexually mature at the age of 40-60 days. Their estrous cycle occurs every 4-6 days. They have a gestation period of 24-28 days and usually have litters of between 5 and 7 pups. Male gerbils sexually mature at 70-84 days of age. (right- female, left- male)

Hamsters

Female hamsters sexually mature at the age of 28 days but should not be bred till 4 months, their estrous cycle lasts 4 days and their gestation period is 15-18 days. They typically have 8 pups to a litter. Male hamsters sexually mature at 2-3 months.

Sexual Identification

Mice, Rats, Rabbits, and Guinea Pigs

Mice

Female mice are sexually mature at the age of 35 days. Their estrous cycle happens every 4-5 days and lasts for 12 hours.The gestation period of a mouse is 19-21 days and they typically have 4-12 young in each litter. Male mice sexually mature at various ages depending upon breed.

Rats

Male rats are sexually mature between the ages of 5 and 6 weeks. Female rats are sexually around the same age. The estrous cycle occurs every 4-6 days. Their gestation period is between 20 and 28 days, and have an average of 6-18 young in a litter.

Rabbits

Female rabbits sexually mature between 3 and 8 months this is the same of male rabbits. They are continuously in estrus and their gestation duration is 28-31 days. Rabbits can have anywhere from 1-14 young.
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Guinea Pigs (R- female L- male)

Female guinea pigs become sexually mature around the age of 4 weeks, their estrous cycle happens every 15 to 17 days. They have a gestation period of about 65 days and typically have 1 to 3 pups in each litter. Males are sexually mature at the age of about 3 weeks.
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