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Effect of diet supplementation with sunflower oil on milk production, fatty acid profile and ruminal fermentation in lactating dairy ewes

Published online by Cambridge University Press:  14 August 2008

Gonzalo Hervás ,
Pilar Luna ,
Ángel R. Mantecón ,
Natalia Castañares ,
Miguel Angel de la Fuente ,
Manuela Juárez  and
Pilar Frutos
Gonzalo Hervás
Affiliation:
Estación Agrícola Experimental (CSIC) Finca Marzanas, 24346 Grulleros, León, Spain
Pilar Luna
Affiliation:
Instituto del Frío (CSIC)José Antonio Novais 10, 28040 Madrid, Spain
Ángel R. Mantecón
Affiliation:
Estación Agrícola Experimental (CSIC) Finca Marzanas, 24346 Grulleros, León, Spain
Natalia Castañares
Affiliation:
Estación Agrícola Experimental (CSIC) Finca Marzanas, 24346 Grulleros, León, Spain
Miguel Angel de la Fuente*
Affiliation:
Instituto del Frío (CSIC)José Antonio Novais 10, 28040 Madrid, Spain
Manuela Juárez
Affiliation:
Instituto del Frío (CSIC)José Antonio Novais 10, 28040 Madrid, Spain
Pilar Frutos
Affiliation:
Estación Agrícola Experimental (CSIC) Finca Marzanas, 24346 Grulleros, León, Spain
*
*For correspondence; e-mail: mafl@if.csic.es
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Abstract

The aim of this research was to enhance the nutritional quality of ewe milk fat by increasing potentially healthy fatty acids (FA) through diet supplementation with unprotected oil rich in linoleic acid, and without detrimental effects on animal performance. Twenty-four ewes were assigned to two high concentrate diets, control or supplemented with 6% sunflower oil (SO), for 4 weeks. No differences between treatments were found in milk production and dry matter intake. Although the SO diet increased milk fat percentage and tended to reduce milk protein concentration, it did not affect milk fat, protein or total solid yield. Most of the modifications in milk FA composition were addressed toward a potentially healthier profile: a decrease in C12:0 to C16:0 and a remarkable increase in the contents of cis-9 trans-11 C18:2 (from 0·94 to 3·60 g/100 g total FA) and trans-11 C18:1 (from 2·23 to 8·61 g/100 g total FA). Furthermore, the levels reached were maintained throughout the period monitored. However, the SO diet increased other trans C18:1 isomer percentages, too. The lack of differences between treatments in the in vitro ruminal fermentation parameters, studied with batch cultures of rumen microorganisms, would indicate no negative effects on ruminal fermentation.

Keywords

Conjugated linoleic acidfatty acidmilksheepvaccenic acid
Type
Research Article
Information
Journal of Dairy Research , Volume 75 , Issue 4 , November 2008 , pp. 399 - 405
Copyright
Copyright © Proprietors of Journal of Dairy Research 2008

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