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

Other Titles:Effet de la supplémentation des brebis laitiéres en páturage par un concentré á base de céréales sur le profil des acides gras du lait
Authors:Hervás, Gonzalo
Gómez-Cortés, Pilar
Fuente, Miguel Ángel de la
Mantecón, Ángel R.
Juárez, Manuela
Giráldez, Francisco Javier
Frutos, Pilar
Keywords:Cereal supplement, CLA, Pasture, Rumenic acid, Sheep, Vaccenic acid, Supplément à base de céréales, Pâturages, Acide rumenique, Brebis, Acide vaccénique
Issue Date:2009
Publisher:Centre international de hautes études agronomiques méditerranéennes
Food and Agriculture Organisation of the United Nations
National Agricultural Research Foundation (Greece)
Citation:Options Méditerranéennes A, 85: 439-444 (2009)
Abstract:This 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.
Description:6 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
Publisher version (URL):http://www.ciheam.org/publications/options-mediterraneennes._5_40027_.php
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