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Effects of supplemental 18:0 on milk fat content in dairy ewes fed a diet rich in fish oil

Otros títulosEffets de la supplémentation en 18:0 sur la teneur de matières grasses du lait chez des brebis laitières alimentées avec un régime riche en huile du poisson
AutorToral, Pablo G. ; Hervás, Gonzalo ; Carreño, David ; González, Jesús Salvador ; Amor, Javier; Frutos, Pilar
Palabras claveSheep
Marine oil
Milk fat depression
Huile marine
Chute du taux butyreux
Fecha de publicaciónjun-2015
EditorCentre international de hautes études agronomiques méditerranéennes
Centre international de recherche en agronomie pour le développement
CitaciónFAO-CIHEAM Network on Sheep and Goats. Joint Seminar of the Sub-Network on Production Systems and Sub-Network on Nutrition : 27 (2015)
ResumenDiet supplementation with fish oil (FO) inhibits the saturation of trans-18:1 to 18:0 in the rumen, increasing the accumulation of t11-18:1 and, consequently, the concentration of the potentially health-promoting c9t11-conjugated linoleic acid (CLA) in milk. However, this feeding strategy also induces milk fat depression (MFD), which has been associated with a shortage of 18:0 for mammary c9-18:1 synthesis and its possible impact on the maintenance of milk fat fluidity. Thus, with the aim of studying whether FO-induced MFD can be alleviated by increased availability of 18:0 for mammary Δ9-desaturation (i.e., for its conversion to c9-18:1), an experiment was performed in dairy ewes. The trial followed a 3×3 Latin square design (4 ewes/group) with 3 periods of 4 weeks each and 3 experimental diets: non-supplemented, supplemented with 2% FO and supplemented with 2% FO plus 2% 18:0. Milk production and composition were analyzed on the last 3 days of each period. At the end of the experiment, the digestibility of supplemental 18:0 was measured using 6 lactating sheep. Supplemented diets had no significant effect on milk yield but, compared with the control, both of them reduced milk fat content in a similar proportion (-20%), which suggests that the addition of 18:0 to the diet does not alleviate FO-induced MFD. Since this result cannot be fully explained by the relatively low digestibility coefficient of the 18:0, further research would be required to elucidate if the lack of response to this fatty acid was attributable to a low mammary uptake or to other factors.
Descripción1 página.-- Trabajo presentado al FAO-CIHEAM Network on Sheep and Goats. Joint Seminar of the Sub-Network on Production Systems and Sub-Network on Nutrition: The value chain in Mediterranean sheep and goats. Industry organisation, marketing strategies, feeding and production systems, p. 27 (S2.2-O3). 16-18 de junio de 2015. Montpellier (Francia).
Versión del editorhttp://www.iamz.ciheam.org/montpellier2015/Programme.html
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