title: Rapeseed and sunflower oilcake as supplements for dairy sheep: animal performance and milk fatty acid concentrations.
abstract: The influence of different amounts of oilseed cake (rapeseed and sunflower) on animal production parameters and fatty acid (FA) concentrations of the milk was studied in a Latxa dairy sheep experimental flock, both in winter (50% oilcakes; indoor feeding) and in spring (30% oilcakes; part-time grazing). The two different levels of the oilcakes tested did not affect animal production parameters or milk yield. Milk fat content and the fat/protein ratio decreased significantly with 30 and 50% sunflower cake. Yet, fat/protein ratio values were within the range for cheesemaking. Both levels of either type of oilcake tested significantly increased the concentrations of nutritionally interesting FA (CLA isomer C18:2cis-9, trans-11, vaccenic, oleic, and total unsaturated FA), while simultaneously decreasing the concentration of atherogenic FA. The atherogenicity indexes of milks from ewes fed 50 or 30% of either oilcake were significantly lower than those of their corresponding control. The use of cakes in winter increased the concentration of nutritionally interesting FA to the values obtained with part-time grazing.
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Amores
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Mailo
authors.initials: M
authors.lastname: Virto
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Ana Isabel
authors.initials: AI
authors.lastname: Nájera
authors.affiliation: Neiker-Tecnalia,P.O. Box 46, 01080 Vitoria-Gasteiz,Spain.
authors.forename: Nerea
authors.initials: N
authors.lastname: Mandaluniz
authors.affiliation: Neiker-Tecnalia,P.O. Box 46, 01080 Vitoria-Gasteiz,Spain.
authors.forename: Josune
authors.initials: J
authors.lastname: Arranz
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: María Angeles
authors.initials: MA
authors.lastname: Bustamante
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Izaskun
authors.initials: I
authors.lastname: Valdivielso
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Ruiz de Gordoa
authors.affiliation: Neiker-Tecnalia,P.O. Box 46, 01080 Vitoria-Gasteiz,Spain.
authors.forename: Aser
authors.initials: A
authors.lastname: García-Rodríguez
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Luis J R
authors.initials: LJ
authors.lastname: Barron
authors.affiliation: Lactiker Research Group, Faculty of Pharmacy,Universidad del País Vasco/Euskal Herriko Unibertsitatea,01006 Vitoria-Gasteiz,Spain.
authors.forename: Mertxe
authors.initials: M
authors.lastname: de Renobales
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D029741:Brassica rapa / Q000737:chemistry*; D003612:Dairying; D004032:Diet / Q000662:veterinary; D019587:Dietary Supplements; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism; D005260:Female; D006368:Helianthus / Q000737:chemistry*; D007774:Lactation; D008892:Milk / Q000737:chemistry*; D012756:Sheep / Q000502:physiology*
chemical_list: D005227:Fatty Acids