[Plasma lipoproteins of the preruminant calf].
The main lipoprotein classes (HDL, LDL, VLDL, chylomicrons) were isolated from the plasma of four 3-week old preruminant Friesian calves. The proportions of proteins and lipids and the fatty acid composition of the different lipid classes were determined over a 7-hour period corresponding to the pre and post-prandial periods. HDL, LDL, VLDL and chylomicrons averaged 58.3, 19.0, 13.3 and 9.1%, respectively, of total lipoproteins. Triglycerides predominated in VLDL and chylomicrons, and cholesterol esters and phospholipids in HDL and LDL. The lipid proportion and fatty acid composition of a given lipoprotein were stable, except for the triglycerides of the chylomicrons (and VLDL) which were hydrolysed during a 2 to 5-hour period after the morning meal, leading to a higher saturation of the remaining triglycerides. Linoleic acid, abundant in cholesterol esters of HDL (46.5%) and LDL (37.2%) and scarce in the cholesterol esters of VLDL (3.5%) and chylomicrons (3.2%), underlined the dual origin (plasma and tissues) of cholesterol esters in young bovines.
D000818:Animals; D000831:Animals, Newborn / Q000097:blood*; D001798:Blood Proteins / Q000378:metabolism; D002417:Cattle; D002784:Cholesterol / Q000097:blood; D002788:Cholesterol Esters / Q000097:blood; D002914:Chylomicrons / Q000097:blood; D005227:Fatty Acids / Q000097:blood; D005502:Food; D008074:Lipoproteins / Q000097:blood*; D008075:Lipoproteins, HDL / Q000097:blood; D008077:Lipoproteins, LDL / Q000097:blood; D008079:Lipoproteins, VLDL / Q000097:blood; D008297:Male; D010743:Phospholipids / Q000097:blood; D014280:Triglycerides / Q000097:blood
D001798:Blood Proteins; D002788:Cholesterol Esters; D002914:Chylomicrons; D005227:Fatty Acids; D008074:Lipoproteins; D008075:Lipoproteins, HDL; D008077:Lipoproteins, LDL; D008079:Lipoproteins, VLDL; D010743:Phospholipids; D014280:Triglycerides; D002784:Cholesterol
Lipoprotéines plasmatiques du veau préruminant.