title: Alterations of the Lipid Metabolome in Dairy Cows Experiencing Excessive Lipolysis Early Postpartum.
abstract: A decrease in insulin sensitivity enhances adipose tissue lipolysis helping early lactation cows counteracting their energy deficit. However, excessive lipolysis poses serious health risks for cows, and its underlying mechanisms are not clearly understood. The present study used targeted ESI-LC-MS/MS-based metabolomics and indirect insulin sensitivity measurements to evaluate metabolic alterations in the serum of dairy cows of various parities experiencing variable lipolysis early postpartum. Thirty (12 primiparous and 18 multiparous) cows of Holstein Friesian and Simmental breeds, fed the same diet and kept under the same management conditions, were sampled at d 21 postpartum and classified as low (n = 10), medium (n = 8), and high (n = 12) lipolysis groups, based on serum concentration of nonesterified fatty acids. Overall, excessive lipolysis in the high group came along with impaired estimated insulin sensitivity and characteristic shifts in acylcarnitine, sphingomyelin, phosphatidylcholine and lysophospholipid metabolome profiles compared to the low group. From the detected phosphatidylcholines mainly those with diacyl-residues showed differences among lipolysis groups. Furthermore, more than half of the detected sphingomyelins were increased in cows experiencing high lipomobilization. Additionally, strong differences in serum acylcarnitines were noticed among lipolysis groups. The study suggests an altered serum phospholipidome in dairy cows associated with an increase in certain long-chain sphingomyelins and the progression of disturbed insulin function. In conclusion, the present study revealed 37 key metabolites as part of alterations in the synthesis or breakdown of sphingolipids and phospholipids associated with lowered estimated insulin sensitivity and excessive lipolysis in early-lactating cows.
authors.affiliation: Institute of Animal Nutrition and Functional Plant Compounds, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
authors.forename: Elke
authors.initials: E
authors.lastname: Humer
authors.affiliation: Institute of Animal Nutrition and Functional Plant Compounds, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
authors.forename: Annabella
authors.initials: A
authors.lastname: Khol-Parisini
authors.affiliation: University Clinic for Swine, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
authors.forename: Barbara U
authors.initials: BU
authors.lastname: Metzler-Zebeli
authors.affiliation: Institute of Livestock Research, Agricultural Research and Education Centre Raumberg-Gumpenstein, Irdning, Austria.
authors.forename: Leonhard
authors.initials: L
authors.lastname: Gruber
authors.affiliation: Institute of Animal Nutrition and Functional Plant Compounds, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Vienna, Austria.
authors.forename: Qendrim
authors.initials: Q
authors.lastname: Zebeli
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000818:Animals; D002417:Cattle; D002853:Chromatography, Liquid / Q000379:methods; D003612:Dairying; D004734:Energy Metabolism; D005230:Fatty Acids, Nonesterified / Q000097:blood; D005260:Female; D007333:Insulin Resistance; D007774:Lactation; D008055:Lipids / Q000097:blood*; D008066:Lipolysis; D008244:Lysophosphatidylcholines / Q000097:blood; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D008892:Milk / Q000378:metabolism*; D010298:Parity; D010713:Phosphatidylcholines / Q000097:blood; D049590:Postpartum Period / Q000097:blood; D013109:Sphingomyelins / Q000097:blood; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D005230:Fatty Acids, Nonesterified; D008055:Lipids; D008244:Lysophosphatidylcholines; D010713:Phosphatidylcholines; D013109:Sphingomyelins