separation of the pubic symphysis. The symphysis (a joint of tough fibrous cartilage which firmly joins the 2 pubic bones) becomes less flexible upon reaching adulthood and may not … The symphysis is a fibrocartilaginous bridge binding together the right and left pubic bones that form the lower part of the pelvic canal. Separation of males and females. This was already noted by Le Gallois in 1812 who described how a fetus having an average head diameter of 20 mm. The Biology of the Guinea Pig, Joseph E. Wagner, Patrick J. This transformation is remarkable in several species, including guinea-pigs, mice, bats and humans [3]. Abstract. An extraordinary example of pelvic relaxation is found in the preg- nant guinea pig. … Breeding after 8 months of age can be fatal for a guinea pig that has not had a previous litter due to dystocia. l.-The Picture on the left is from an x-r&~ of Guinea Pig 408 taken three days before she was mated. Fig. Bree allowing considerable separation of the pubic bones. This stiffening makes it difficult for the sow’s young to pass through the birth canal. I just know that she's getting close and I kinda need to know how to tell if my guinea pigs pelvic bones are seperating to make room for the babies to pass through. Dystocia in Guinea Pigs. Thanks to all who help! The symphysis is a joint of tough fibrous cartilage located between the two pubic bones of the pelvis. Dystocia occurs commonly in guinea pigs and may be due to uterine inertia, pregnancy toxemia, fetuses that are too large to pass through the pelvic canal, or because the os coxae fail to separate, despite relaxin release, to the 2.5–3 cm needed to allow a fetus to pass. Ok my guinea pig is really huge now and at least 7 weeks into her pregnancy. Keep them all together, they are like a support system for the new mum. If you gently rest your finger between the pelvic bones and the gap is about as wide as your finger (about 1 inch) then she should have babies within the next hour-2 days. In sows (pregnant guinea pigs), this is usually caused by the normal stiffening of the tough fibrous cartilage which joins the two pubic bones – medically referred to as the symphysis. In adult female guinea-pigs, the interpubic joint is a non-synovial joint of the cartilaginous type that is movable and connected to the pubic bones by fibrous (symphysis) cartilage [4]. Your pig may also loose interest in food, and her daily habits may change (particularly toileting patterns). I don't know exactly when she become pregnant so that doens't help any. Gently placing your guinea pig on her back on your chest and feel for the 2 small bones directly in front of her genitals. Dystocia is a clinical condition in which the process of giving birth is slowed or is made difficult for the birthing mother. 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