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Postprandial Lipoprotein Composition in Pigs Fed Diets Differing in Type and Amount of Dietary Fat^1,2,

Nutritional Physiology Group, Department of Animal Science, Iowa State University, Ames, IA 50011

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.

KEY WORDS: • pigs • fat • postprandial • lipoproteins • cholesterol

¹ Supported in part by the Iowa Beef Industry Council.

² Journal Paper No. J-14269 of the Iowa Agriculture and Home Economics Experiment Station, Ames, IA. Project 2735.

³ To whom correspondence should be addressed.

Manuscript received 13 November 1990. Revision accepted 2 July 1991.