Journal of Food, Agriculture and Environment

Conjugated linoleic acid and ω-3 fatty acid in sheep milk was increased by part-time grazing and camelina seed diet


Daniel Mierlita

Recieved Date: 2014-01-16, Accepted Date: 2015-03-28


The objective of this study was to investigate the effects of ewes’ feeding system (fed indoor or part-time grazing system) in combination or not with camelina seed (Camelina sativa L.) as fat supplement on milk yield and milk fatty acid (FA) composition. Experimental diets were constituted by a 2 x 2 factorial arrangement of feeding system (I: indoors during the entire experiment and received 1400 g DM grass hay/d or PG: grazing - 4 h/day + 700 g DM grass hay/d) and camelina seed (-Cs = no camelina seed vs. +Cs = 140 g/d Cs). All animals received daily 700 g DM concentrate for lactating. Daily milk yield and milk fat yield (p<0.01) were increased by part-time grazing and diets supplementation of Cs. Milk from ewes fed a part-time grazing had a more favourable fatty acid pattern, high total CLA (conjugated linoleic acid) and n-3 FA content. Supplementation of Cs decreased the short chain FA, medium-chain FA, saturated FA and hypercholesterolaemic FA (HFA: C12:0 + C14:0 + C16:0) in ewes milk fat while increased trans-vaccenic acid (trans-11-C18:1, TVA), α-linolenic acid (ALA-C18:3 n-3), CLA, EPA (eicosapentaenoic acid), DHA (docosahexaenoic acid), monounsaturated FA, polyunsaturated FA and long-chain FA in ewes milk fat (p<0.001). Especially, c9,t11-CLA; t10,c12-CLA and ω-3 FA (ALA + EPA + DHA) in milk fat were highest when ewes fed PG/+Cs diet. The decrease in HFA resulted in the decrease of milk fat atherogenic index (AI) of PG diet ewes and of those whose diet was supplemented with camelina seed (+Cs). Based on the result, it is suggested that part-time grazing and supplementation of camelina seed should be an effective method to increase CLA isomers and ω-3 fatty acid in ewes milk fat without negative effect on lactating performance.


Sheep milk, cis-9, trans-11 CLA, vaccenic acid (trans-11-C18:1), α-linolenic acid (C18:3 n-3), atherogenicitiy index

Journal: Journal of Food, Agriculture and Environment
Year: 2015
Volume: 13
Issue: 2
Category: Food and Health
Pages: 76-81

Full text for Subscribers

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

Purchase this Article:   20 Purchase PDF Order Reprints for 15

Share this article :