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Animal

Title:		Milk fat depression and plasma lipids in dairy cows and goats
Author(s):		Delavaud C; Fougere H; Bertrand-Michel J; Bernard L;
Address:		"Universite Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, Saint-Genes-Champanelle, France. Institut des Maladies Metaboliques et Cardiovasculaires (I2MC), Inserm/Universite Paul Sabatier UMR1048, Toulouse, France. Universite Clermont Auvergne, INRAE, VetAgro Sup, UMR Herbivores, Saint-Genes-Champanelle, France. Electronic address: laurence.bernard@inrae.fr"
Journal Title:		Animal
Year:		2022
Volume:		20221129
Issue:		12
Page Number:		100635 -
DOI:		10.1016/j.animal.2022.100635
ISSN/ISBN:		1751-732X (Electronic) 1751-7311 (Linking)
Abstract:		"This study examines the effects of diets supplemented with various lipids selected to induce divergent milk fat content responses (including a milk fat depression) between dairy cows and goats on plasma lipid composition. The objective was to better understand the mechanisms behind the regulation of milk fat secretion in these two ruminant species. Twelve Holstein cows and 12 Alpine goats were fed a basal diet not supplemented (CTL) or supplemented with corn oil plus wheat starch (COS, 5% DM intake (DMI)), marine algae powder of Schizochytrium sp. (MAP, 1.5% DMI), or hydrogenated palm oil (HPO, 3% DMI), in a replicated 4?ª+x?ª+4 Latin square design, during 28?ª+days. On day 27, blood samples were collected for lipid analysis. Plasma lipid classes were quantified by high-performance thin-layer chromatography, with triacylglycerol (TAG) and free fatty acid (FFA) fractions analysed for FA composition by GLC. Plasma molecular species of TAG and ceramides were determined by HPLC-high-resolution MS and by liquid chromatography-triple quadrupole, respectively. Irrespective of diet, plasma total lipid content was higher in cows than goats (+61%), and TAG concentration was higher in goats than cows (+157%). In cows, conversely to goats, COS increased the trans-10 C18:1 proportion in the free FA (+248%) and the TAG (+195%) fractions. In cows and goats, MAP induced increases in cholesterol esters, cholesterol and phospholipids compared to CTL and changes in the plasma free FA and FA of TAG profiles. In both ruminant species, the concentrations of the lipid fractions were unchanged by HPO compared to CTL. Our results point to species specificities and different diet effects in plasma concentrations and compositions of lipid fractions in cows and goats. These new data highlight how diets, that induce large variations in milk fat secretions, affect the plasma lipid classes available for milk fat synthesis"
Keywords:		Female Cattle Animals *Milk/chemistry *Fatty Acids/analysis Goats/physiology Depression Dietary Supplements/analysis Diet/veterinary Lactation/physiology Animal Feed/analysis Ceramide Lipid supplement Lipidomic Plasma triacylglycerol Ruminant;
Notes:		"MedlineDelavaud, C Fougere, H Bertrand-Michel, J Bernard, L eng England 2022/12/03 Animal. 2022 Dec; 16(12):100635. doi: 10.1016/j.animal.2022.100635. Epub 2022 Nov 29"