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ARTICLE |
1 Teagasc, Grange Research Centre, Dunsany, Co. Meath, Ireland; School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Dublin 4, Ireland
2 Teagasc, Grange Research Centre, Dunsany, Co. Meath, Ireland
3 School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Dublin 4, Ireland
* To whom correspondence should be addressed. E-mail: amoloney{at}grange.teagasc.ie.
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Abstract |
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Our objective was to determine the effect of oil supplementation of pasture fed beef cattle on the fatty acids, particularly CLA and PUFA, of muscle s.c. adipose tissue. Forty-five Charolais crossbred heifers were blocked on bodyweight and randomly assigned to one of three dietary regimens in a randomised complete block design (n = 15). The three treatments were: unsupplemented grazing (GO), restricted grazing plus a sunflower oil-enriched ration (SO), or restricted grazing plus a linseed oil-enriched ration (LO). Animals were fed the experimental diets for approximately 158 d. Samples of Longissimus dorsi muscle and s.c. adipose tissue were taken postmortem, the muscle fat was separated into neutral (NL) and polar lipids (PL) (no separation was performed on the s.c. adipose tissue) and the fatty acid profile was determined by GLC. No effect of dietary treatment on carcass weight or total fatty acid concentration (mean 2,571mg/100 g muscle) in muscle fat was detected. Animals offered SO had a higher (P<0.001) proportion of CLA and C18:1trans-11 (1.90 and 9.35 g/100 g/100g fatty acids versus 1.35 and 6.89 g/100 g fatty acids, respectively) in NL of muscle fat compared to those offered LO, which, had a higher proportion of CLA and C18:1trans-11 than animals offered GO (0.78 gg and 3.37g/100 g fatty acids, respectively). Similar effects were observed in the PL and s.c. lipid. The PUFA:SFA ratio was higher in muscle fat and s.c. adipose tissue from supplemented animals than in those offered GO (P < 0.001). Compared to LO, the PUFA:SFA ratio was higher (P<0.05) in muscle fat of animals offered SO, but there was no difference between SO and LO in this ratio in s.c. adipose tissue. The n-6:n-3 PUFA ratio was similar in muscle and s.c.adipose tissue for GO and LO, but it was higher (P<0.05) for SO. It is concluded that supplementation of pasture-fed cattle with plant oil-enriched concentrates resulted in an increase in beef fat of some fatty acids considered to be of benefit to human health. Concentrates enriched with sunflower oil were more effective in increasing CLA concentration, while linseed oil-enriched concentrates resulted in a more favourable n-6:n-3 PUFA ratio. The relevance to human health of the associated increase in C18:1 trans 11 merits investigation.
Key Words: CLA, Grazing, Plant Oils, PUFA
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