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

Author: Daniel Mierlita
Received 16 January 2014, accepted 28 March 2015.
Abstract

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.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263Year: 2015, Vol. 13, Issue 2, pages 76-81.Publisher: WFL.


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