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Comparison of Fatty Acids from Lipid Classes of Serum Lipoproteins and Other Lipids in the Bison^{1, 2,}

Department of Dairy Husbandry, University of Minnesota, St. Paul

ABSTRACT

High- (D > 1.063) and low-density (D < 1.063) lipoproteins, comprised 64 and 36%, respectively, of bison serum total lipids. Protein-bound nonesterified fatty acids accounted for less than 1%. High-density lipoproteins (HDL) contained comparatively greater concentrations of sterol esters, nonesterified fatty acids, and phospholipids. Liver lipids showed 53% triglycerides and 37% phospholipids. Rumen content lipids contained 4, 16, 17, 22, and 33%, respectively, of monoglycerides, triglycerides, sterols, phospholipids, and nonesterified fatty acids. Lipids in abomasal fluid showed 2% monoglycerides, 50% phospholipids, and 12% nonesterified fatty acids. HDL lipid classes resembled those of the low-density lipoproteins (LDL) in fatty acid composition, but triglycerides were more saturated and sterol esters more unsaturated in the latter. Oleate was the predominant unsaturated fatty acid in most of the lipid classes. Glycerides of whole serum and HDL; nonesterified fatty acids of whole serum, HDL, and LDL; and diglycerides of liver tissue were similar in fatty acid composition to the long-chain fatty acids of bison milk fat. Similarity to other ruminant species was noted in the fatty acid composition of rumen content total lipids, liver tissue lipid classes, and milk fat. However, fatty acid patterning of HDL and LDL lipid classes was species-specific.

¹ Scientific Journal Series, Paper No. 5182, Minnesota Agricultural Experiment Station.

² Supported in part by the U.S. Public Health Service (AM 06721-02).