[The prenatal dynamics of erythropoiesis in the liver of the guinea pig].

Erythroid cell kinetics in the liver of guinea pig embryo was investigated on the semithin epon sections with stereologic and morphometrical methods. It was shown that from 20 to 60 days of prenatal development the volume density (VD) of proerythroblasts decreased 15 times. A decrease in the VD of another erythroblasts was less pronounced. These changes coincided with the liver parenchyma reconstruction. It was concluded that the main influence on erythroid cell kinetics was determined by a surpassing disappearance of the precursor cells from the prenatal liver and, also, that stability of some morphological parameters of hemopoietic stroma was important for realization of the liver hemopoietic activity.