POSTPRANDIAL LIPOPROTEIN COMPOSITION IN PIGS FED DIETS DIFFERING IN TYPE AND AMOUNT OF DIETARY-FAT

To determine the effects of diet on postprandial lipoprotein composition, growing pigs were fed diets containing 20 or 40% of energy as soybean oil, tallow or a 50:50 blend of soybean oil and tallow. At the end of wk 6, a blood sample was drawn from pigs fasted for 12 h. Pigs were then fed, and blood samples were drawn 1 and 4 h later. In LDL, concentrations of free and total cholesterol were greater in pigs fed 40% of energy as fat than in pigs fed 20% of energy as fat (P < 0.02). Pigs fasted for 12 h had lesser concentrations of triacylglycerol and greater concentrations of phospholipid in LDL and HDL than did pigs fasted for 1 and 4 h (P < 0.05). In HDL, total cholesterol and phospholipid concentrations were greater in pigs fed 40% of energy as fat than in pigs fed 20% of energy as fat (P < 0.01). A greater concentration of triacylglycerol was found in VLDL of pigs fed 40% of energy as fat than in pigs fed 20% of energy as fat (P < 0.01). Amount of dietary fat had a greater effect than did type of dietary fat on composition of lipoproteins from postprandial pigs.