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Fatty Acid Composition of Lipid in the Thoracic Duct Lymph of Grazing Cows

Dairy Research Foundation, University of Sydney, Camden, New South Wales, 2570, Australia

ABSTRACT

The fatty acid composition of lipid fractions was studied in the thoracic duct lymph of three cows grazing on pasture. One cow (a three-year-old Ayrshire cross) was dry and the other two (a five-year-old Jersey and a four-year-old Guernsey) were in the second and sixth months of lactation, respectively. The composition of triglyceride in lymph samples collected at different times from the three cows was very similar. The major fatty acids in the triglyceride were 16:0, 18:0, and 18:1 which comprised, respectively, 22, 42, and 17% of the total. Plasma triglyceride had a similar composition. The major fatty acids of lymph phospholipid from one cow were 16:0, 18:0, 18:1, and 18:2 which formed, respectively, 17, 28, 13, and 24% of the total. Plasma phospholipid had a similar composition. Lymph cholesterol ester from the same cow contained predominantly 18:0, 18:2, and 18:3, which made up 15, 24, and 16%, respectively, of the total fatty acids. The cholesterol ester of plasma contained higher proportions of 18:2 and 18:3 than that of lymph. A large number of minor components, principally branched-chain and odd carbon-number fatty acids, were found in approximately similar proportions in all lipid fractions.