 content phosphatid triglycerid cholesterol placenta matern fetal new-born liver white rat thin-layer-chromatograph examin matern rat liver rise triglycerid increas esterifi cholesterol strike chang content free cholesterol lipid phosphoru fraction examin lecithin colamin cephalin sphingomyelin lysolecithin compar liver adult rat fetal liver 50 cent lipid phosphoru differ condit concentr lecithin colamin cephalin 19th dai content triglycerid lower mother rat refer dry weight decreas phosphatid fraction well free cholesterol slight rise triglycerid 19th 22nd dai rise phosphatid concentr valu adult rat occur birth influenc milk food lead consider increas triglycerid valu phospholipid- triglycerid concentr placenta correspond fetal liver sole content free cholesterol higher pregnanc content triglycerid drop 22nd dai 