PLASMA-LIPID TRANSPORT IN THE HORSE (EQUUS-CABALLUS)

1. Equine plasma contains lipoproteins corresponding to very low densi ty (VLDL), low density (LDL) and high density lipoproteins (HDL). 2. H DL accounts for approximately 60% of plasma lipoprotein mass and consi sts of a single population of particles. 3. LDL is heterogeneous compr ising three discrete subfractions. 4. Two proteins are found in the re gion of apolipoprotein (apo) B-100 in VLDL and LDL and a third similar to apoB-48 is in VLDL. 5. Lecithin:cholesterol acyl transferase is ac tive in plasma and hepatic lipase and lipoprotein lipase are evident i n post-heparin plasma. 6. There is no significant cholesteryl ester tr ansfer protein activity.