title: Effect of diet supplementation with sunflower oil on milk production, fatty acid profile and ruminal fermentation in lactating dairy ewes.
abstract: The aim of this research was to enhance the nutritional quality of ewe milk fat by increasing potentially healthy fatty acids (FA) through diet supplementation with unprotected oil rich in linoleic acid, and without detrimental effects on animal performance. Twenty-four ewes were assigned to two high concentrate diets, control or supplemented with 6% sunflower oil (SO), for 4 weeks. No differences between treatments were found in milk production and dry matter intake. Although the SO diet increased milk fat percentage and tended to reduce milk protein concentration, it did not affect milk fat, protein or total solid yield. Most of the modifications in milk FA composition were addressed toward a potentially healthier profile: a decrease in C12:0 to C16:0 and a remarkable increase in the contents of cis-9 trans-11 C18:2 (from 0.94 to 3.60 g/100 g total FA) and trans-11 C18:1 (from 2.23 to 8.61 g/100 g total FA). Furthermore, the levels reached were maintained throughout the period monitored. However, the SO diet increased other trans C18:1 isomer percentages, too. The lack of differences between treatments in the in vitro ruminal fermentation parameters, studied with batch cultures of rumen microorganisms, would indicate no negative effects on ruminal fermentation.
authors.affiliation: Estación Agrícola Experimental (CSIC) Finca Marzanas, 24346 Grulleros, León, Spain.
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Hervás
authors.forename: Pilar
authors.initials: P
authors.lastname: Luna
authors.forename: Angel R
authors.initials: AR
authors.lastname: Mantecón
authors.forename: Natalia
authors.initials: N
authors.lastname: Castañares
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: de la Fuente
authors.forename: Manuela
authors.initials: M
authors.lastname: Juárez
authors.forename: Pilar
authors.initials: P
authors.lastname: Frutos
mesh_terms: D000821:Animal Feed; D000818:Animals; D004043:Dietary Fiber; D004044:Dietary Proteins; D019587:Dietary Supplements; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D005285:Fermentation; D007774:Lactation / Q000187:drug effects / Q000502:physiology*; D008892:Milk / Q000737:chemistry / Q000187:drug effects / Q000502:physiology*; D008894:Milk Proteins / Q000032:analysis; D010938:Plant Oils / Q000008:administration & dosage* / Q000494:pharmacology; D012756:Sheep; D000074242:Sunflower Oil
chemical_list: D004043:Dietary Fiber; D004044:Dietary Proteins; D005227:Fatty Acids; D008894:Milk Proteins; D010938:Plant Oils; D000074242:Sunflower Oil