Guinea Pig Reproduction and Breeding

Individual pet owners should not attempt to breed guinea pigs, according to experts. It can be difficult to find homes for young guinea pigs with caring and conscientious pet owners. Female guinea pigs' lifespan is frequently reduced by breeding. Because of the usual hardening of the pubic symphysis (a junction of thick fibrous cartilage between the two pubic bones of the pelvis) that happens when the female reaches adulthood, breeding a female guinea pig for the first time after she reaches 8 months of age can be extremely harmful. Sows who reach adulthood without having had a previous pregnancy may be unable to birth their young normally. Cesarean sections are rarely successful in guinea pigs, even when performed by a veterinarian with guinea pig knowledge.


Pet guinea pigs can be spayed or neutered by a veterinarian who is familiar with small animals, but the procedure is costly and risky. Neutering a male is typically less difficult than spaying a female. Guinea pigs, on the other hand, frequently do not respond well to surgery, anesthesia, or being housed in unusual circumstances. Separating male and female guinea pigs is the safest, simplest, and least expensive technique to avoid breeding.

If you do decide to have your guinea pig spayed or neutered, look for a veterinarian that has performed a large number of these procedures successfully. While recovering from surgery, keep your pet quiet and apart from other guinea pigs. A modest, tidy cage with towels for bedding is sufficient. At least twice a day, the towels should be replaced. Make sure the guinea pig is eating and drinking; additional vitamin C may also be beneficial.

Male guinea pigs (boars) often reach sexual maturity around 2-3 months of age and can mate. Female guinea pigs (sows) normally reach sexual maturity after 2 months (55 to 70 days). However, both males and females can mature and become reproductive at a younger age. Females can be estrous or fertile at any time of year, but they are most common in the spring. The estrous cycle is 16 days long. A female is fertile for roughly 6 to 11 hours, mostly during the night. Shortly after giving birth, female guinea pigs begin a fresh estrous cycle.


The gestation time for guinea pigs ranges from 59 to 72 days. The litter size can range from 1 to 8 pups, but 2 to 4 pups are more frequent. A female can have up to 5 litters every year. When a guinea pig is about to give birth, any male guinea pigs nearby will gather and strive to become the dominant male to both protect and mate with the female. The female experiences a brief postpartum estrus that lasts about half a day, and in the absence of a dominant male, all of the males will attempt to mate with the new mother.

Newborn Infant Care

Guinea pigs weigh about 3.5 ounces (100 g) at birth. They have hair and can see and run despite their little size. They will nurse from their mother for the first two days but will be able to munch on solid food (such as moistened pellets) after that. The mother has one pair of mammary glands from which the infants will milk until they are about three weeks old. When the offspring reach about 6 ounces (170 g), they will quit nursing and begin eating the same foods as their parents.

When newborn guinea pigs are only 2 or 3 weeks old, it is critical to begin handling them carefully. This is the stage at which baby guinea pigs form ties with humans and learn to accept being held.

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