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Título

Milk production and fatty acid profile after three weeks of diet supplementation with sunflower oil and marine algae in dairy ewes

AutorToral, Pablo G. ; Gómez-Cortés, Pilar ; Frutos, Pilar ; Fuente, Miguel Ángel de la ; Juárez, Manuela ; Hervás, Gonzalo
Palabras claveCLA
PUFA
Milk fat depression
Sheep
Fecha de publicaciónoct-2009
EditorUniversidad de León
Food and Agriculture Organisation of the United Nations
Centre international de hautes études agronomiques méditerranéennes
Consejo Superior de Investigaciones Científicas (España)
Citación13th Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition: Challenging strategies to promote sheep and goat sector in the current global context, p.78 (2009)
ResumenFeeding a source of long chain polyunsaturated fatty acids (PUFA), such as marine lipids, plus a linoleic-rich vegetable oil notably increases milk content of some potentially healthy fatty acids (FA), such as conjugated linoleic acid (CLA). In dairy cows, this nutritional strategy causes detrimental effects on animal performance, reducing milk fat content, but the situation in sheep might be substantially different, as this species seems to be less prone to milk fat depression than cows. This work was conducted to investigate the effect of supplementation with sunflower oil (SO) plus incremental levels of marine algae (MA) on dairy sheep performance and milk FA profile. Fifty Assaf ewes in mid-lactation, distributed in 10 lots of 5 animals each, were allocated to 5 treatments (feeding regimes; 2 lots/treatment). All animals received a total mixed ration (50:50 forage:concentrate ratio) without lipid supplementation (Control) or supplemented with 25 g SO/kg DM plus 0, 8, 16, or 24 g MA/kg (SO, SOMA1, SOMA2, and SOMA3, respectively). Milk production and composition were recorded after 3 weeks on treatment. No significant differences in DM intake between treatments were observed during this three-week period (3.5 kg DM/animal and day). SO plus the highest level of algae supplement (SOMA3) resulted in the highest cis-9 trans-11 CLA content in milk fat (3.89 vs. 1.58 and 0.48 % of total FA for SOMA3, SO and Control diets, respectively), while the atherogenicity index decreased in all supplemented treatments compared to the Control (P<0.01) but without differences among them. On the other hand, although there were no significant differences in milk production between treatments, milk fat content decreased in all ewes fed marine algae (-21% on average; P<0.001). The joined action of some biohydrogenation intermediates and the important reduction in stearic acid (P<0.001) are discussed to explain these differences.
Descripción1 page.-- Contributed to: 13 Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition: Challenging strategies to promote sheep and goat sector in the current global context (León, Spain, oct 14-16, 2009).
URIhttp://hdl.handle.net/10261/18040
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