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Effects of linseed oil and natural or synthetic vitamin E supplementation in lactating ewes' diets on meat fatty acid profile and lipid oxidation from their milk fed lambs

Author:
Gallardo, B., Manca, M.G., Mantecón, A.R., Nudda, A., Manso, T.
Source:
Meat science 2015 v.102 pp. 79-89
ISSN:
0309-1740
Subject:
ewes, fatty acid composition, lactation, lamb meat, lambs, linseed oil, lipid peroxidation, milk fatty acids, rancidity, vitamin E, vitamin supplements
Abstract:
Forty-eight Churra ewes with their new-born lambs were separated into four dietary treatments: Control (without added fat), LO (with 3% linseed oil), LO-Syn E (LO plus 400mg/kg TMR of synthetic vitamin E) and LO-Nat E (LO plus 400g/kg TMR of natural vitamin E). Linseed oil caused an increase in trans-11 C18:1 (VA), trans-10 C18:1, cis-9, trans-11 C18:2 (RA), trans-10, cis-12 C18:2 and C18:3 n-3 (ALA) in milk fat compared to the Control. The addition of vitamin E to the LO diets did not influence significantly the majority of milk fatty acids compared with the LO diet alone. Trans-10 C18:1, VA, RA, trans-10, cis-12 C18:2 and LA levels were higher in intramuscular lamb fat from treatments with linseed oil. No statistically significant differences were observed in these FA due to vitamin E supplementation or the type of vitamin E (synthetic vs. natural). Vitamin supplementation resulted in lipid oxidation levels below the threshold values for detection of rancidity in lamb meat.
Agid:
5338970