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Effect of supplementation of grazing dairy ewes with a cereal concentrate on milk fatty acid profile

Otros títulosEffet de la supplémentation des brebis laitiéres en páturage par un concentré á base de céréales sur le profil des acides gras du lait
AutorHervás, Gonzalo ; Gómez-Cortés, Pilar ; Fuente, Miguel Ángel de la ; Mantecón, Ángel R. ; Juárez, Manuela ; Giráldez, Francisco Javier ; Frutos, Pilar
Palabras claveCereal supplement
Rumenic acid
Vaccenic acid
Supplément à base de céréales
Acide rumenique
Acide vaccénique
Fecha de publicación2009
EditorCentre international de hautes études agronomiques méditerranéennes
Food and Agriculture Organisation of the United Nations
National Agricultural Research Foundation (Greece)
CitaciónOptions Méditerranéennes A, 85: 439-444 (2009)
ResumenThis work was conducted to investigate the effect of supplementing grazing ewes on pasture with a cereal concentrate on the milk fatty acid (FA) profile. Ninety Assaf ewes in mid-lactation were distributed in 9 lots of 10 animals each and allocated to three feeding regimes: (i) P - ewes were only allowed to graze pasture (an irrigated sward of Lolium perenne, Trifolium pratense and Dactylis glomerata);( ii) SP - grazing ewes were supplemented with cat grain (700 g/animal per day); and (iii) TMR - ewes were fed ad libitum a total mixed ration (TMR; 80:20 concentrate/forage ratio). Milk yield and composition were recorded after 3 weeks. There were no significant differences in milk yield between P and SP; the highest production being observed for TMR. Milk fat from SP and TMR ewes presented similar concentrations of rumenic (cis-9 trans-11 C18:2) and vaccenic acids (trans-11 C18:1, the rumen-derived precursor for endogenous synthesis of CLA). Total conjugated linoleic acid (CLA) was slightly higher in SP than in TMR but far from the results observed in grazing ewes receibing no supplement (2.96. 1.71 and 1.35 for P. SP and TMR, respectively). The atherogenity index in SP milk fat was not different from that observed in milk from animals on pasture (1.45 for P, 1.61 for SP and 3.25 for TMR). It is concluded that, when pasture quality and availability are not limiting for dairy production, supplementation of grazing ewes with oat grain compromises the milk FA profile without any significant positive effect on milk production.
Descripción6 pages, 3 tables.-- Contributed to: 12th Seminar of the FAO-CIHEAM Sub-Network on Sheep and Goat Nutrition "Nutritional and foraging ecology of sheep and goats" (Thessaloniki, Greece, Oct 11-13, 2007).
Later published as paper in: Journal of Dairy Science 92(8):3964-3972 (2009), https://digital.csic.es/handle/10261/15621
Versión del editorhttp://www.ciheam.org/publications/options-mediterraneennes._5_40027_.php
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