title: Effects of feeding increasing dietary levels of high oleic or regular sunflower or linseed oil on fatty acid profile of goat milk.
abstract: In this work, the effects of increasing amounts of 3 plant oils in diets on the fatty acid (FA) profile of goat milk were studied. The study consisted of 3 experiments, one per oil tested (linseed oil, LO; high oleic sunflower oil, HOSFO; and regular sunflower oil, RSFO). The 3 experiments were conducted successively on 12 Malagueña goats, which were assigned at random to 1 of 4 treatments: 0, 30, 48, and 66 (H) g of added oil/d. A basal diet made of alfalfa hay and pelleted concentrate (33:67) was used in all of the experiments. For each animal, milk samples collected after 15 d on treatments were analyzed for fat, protein, lactose, and FA composition, whereas individual milk yield was measured the last 3 d of each experiment. Oil supplementation affected neither dry matter intake nor milk production traits. Increasing the oil supplementation decreased the content of saturated FA (especially 16:0) in milk fat and increased mono- and polyunsaturated FA in a linear manner. Vaccenic acid content linearly increased with the oil supplementation by 370, 217, and 634% to 5.32, 2.66, and 5.09 g/100 g of total FA methyl esters with the H diet in LO, HOSFO, and RSFO experiments, respectively. Rumenic acid content linearly increased with LO and RSFO supplementation by 298 and 354% from 0.53 and 0.41 g/100 g of total FA methyl esters with the 0 g of added oil/d diet. The content of trans-10-18:1 was not affected by LO supplementation but showed an increasing linear trend with HOSFO supplementation and linearly increased with RSFO supplementation. The ratio of n-6 to n-3 polyunsaturated FA in milk fat was decreased by about 70% with the H diet in the LO experiment and it was increased by 54 and 82% with the H diet in the HOSFO and RSFO experiments. In conclusion, LO supplementation in this work seemed to be the most favorable alternative compared with HOSFO or RSFO supplementation.
authors.affiliation: Departamento de Producción Animal (Universidad de Córdoba), Ctra. Madrid-Cádiz, s/n. Campus de Rabanales, 14014 Córdoba, Spain.
authors.forename: A L
authors.initials: AL
authors.lastname: Martínez Marín
authors.forename: P
authors.initials: P
authors.lastname: Gómez-Cortés
authors.forename: G
authors.initials: G
authors.lastname: Gómez Castro
authors.forename: M
authors.initials: M
authors.lastname: Juárez
authors.forename: L
authors.initials: L
authors.lastname: Pérez Alba
authors.forename: M
authors.initials: M
authors.lastname: Pérez Hernández
authors.forename: M A
authors.initials: MA
authors.lastname: de la Fuente
mesh_terms: D000818:Animals; D004032:Diet / Q000662:veterinary; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage; D005223:Fats / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis*; D005260:Female; D006041:Goats / Q000378:metabolism*; D007785:Lactose / Q000032:analysis; D019787:Linoleic Acid / Q000008:administration & dosage; D008043:Linseed Oil / Q000008:administration & dosage*; D008892:Milk / Q000737:chemistry*; D008894:Milk Proteins / Q000032:analysis; D019301:Oleic Acid / Q000008:administration & dosage*; D010938:Plant Oils / Q000008:administration & dosage*; D000074242:Sunflower Oil
chemical_list: D004042:Dietary Fats, Unsaturated; D005223:Fats; D005227:Fatty Acids; D008894:Milk Proteins; D010938:Plant Oils; D000074242:Sunflower Oil; D019301:Oleic Acid; D008043:Linseed Oil; D019787:Linoleic Acid; D007785:Lactose