[Analysis of the steroid hormones in pig blastocysts]

The steroid hormonal activity was established in the pig blastocysts by means of histochemical methods. This is supported by the presence of hormones (pregnenolon, pregnandion), activity of 3beta-ol steroid dehydrogenase, high content of lipids (sterols) in the trophoblast. The results of thin-layer chromatography on silicagel suggest that the qualitative composition of lipids of the early embryos and the yellow bodies of the ovaries at the corresponding stage of pregnancy is the same.