Fetal resorption (also known as fetus resorption) is the disintegration and assimilation of one or more fetuses in the uterus at any stage after the completion of organogenesis, which, in humans, is after the ninth week of gestation. Before organogenesis, the process is called embryo loss. Resorption is more likely to happen early on in the gestation than later on; a later death of a fetus is likely to result in a miscarriage.
In 1998, an ultrasound study found that the resorption of one or two conceptuses happen in up to 10% of all dog pregnancies, although many cases of assumed complete resorption of an entire litter are likely to have just been the bitch experiencing a pseudopregnancy.
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