Abstract
Five kinds of experimental fats with different P/S ratios were fed to rats for 3 weeks. The rat's plasma and liver lipids, and the fatty acid composition of their plasma, liver, testes and epididymal adipose tissues were determined. As the P/S ratio in these dietary fats decreased, the levels of cholesterol and phospholipids in the plasma decreased, while the plasma triglyceride level increased. The plasma HDL-cholesterol level and liver lipids were not significantly different among the experimental groups. The proportion of linoleic acid (C18 : 2) and arachidonic acid (C20 : 4) in the plasma, and the proportion of C18 : 2 in the liver and epididymal adipose tissues increased as the P/S ratio in dietary fats grew. However the proportion of each fatty acid in the testes remained constant in spite of the change in the P/S ratio. The C20 : 4/C18 : 2 ratios of the rat's liver and testes varied in response to the change of dietary P/S ratio, but those of plasma and adipose tissues did not.
