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Influence of oilseed supplementation on ruminant meat and milk with emphasis on fatty acids

Turner, Tyler (2010). Influence of oilseed supplementation on ruminant meat and milk with emphasis on fatty acids. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2010:54
ISBN 978-91-576-7467-8
[Doctoral thesis]

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In the human diet, long-chain polyunsaturated fatty acids (LC-PUFA, ≥ C20) are supplied almost exclusively from animal sources. Red meat represents a significant source of LC-PUFA in many areas of the world. However, the health aspects of consuming ruminant tissues are often viewed critically due to the proportions of saturated fatty acids (SFA). The health benefits from the monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) in ruminant muscle are often overlooked. Improvements to the lipid quality of ruminant tissues can be achieved through dietary manipulation. This thesis focuses on oilseed supplementation as a means to alter the FA profile of ruminant tissues. The results obtained indicate that the FA profile of the oilseed supplement and the feeding duration affected the muscle FA profile. The diet and nutritional status of the lactating ewes affected the milk FA profile, in turn affecting the growth performance and M. semispinalis capitis FA profile of the lambs after weaning. Modifying the FA profile of ruminant meat requires reducing the accessibility of dietary PUFA to ruminal biohydrogenation. Heat processing has been shown to alter the oilseed protein structure, increasing the post-ruminal supply of amino acids and PUFA. Roasting and extruding were equally effective processes for increasing the in vitro undegradable N fraction of linseed and soybean without affecting N digestibility. The M. masseter and M. pars costalis diaphragmatis, collected from animals fed roasted or extruded oilseeds had PUFA profiles which were influenced both by the dietary n-6/n-3 PUFA ratio and by the Δ5- (Δ5d) and Δ6- (Δ6d) desaturase enzymes responsible for forming LC-PUFA. Moreover, the Δ5d and Δ6d protein expressions were correlated within the muscles, whereas the dietary regulation of the Δ5d and Δ6d protein expression was muscle specific. Based on these findings, dietary oilseed supplementation modified the FA profile of ruminant products, improving the health benefits from their consumption. Further studies into oilseed processing and influence of diet on the lipogenic pathways will assist in feeding strategies to further enhance the health benefits from ruminant meat consumption.

Authors/Creators:Turner, Tyler
Title:Influence of oilseed supplementation on ruminant meat and milk with emphasis on fatty acids
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2010
Number of Pages:178
ALLI. Turner, T., Hessle, A., Lundström, K., Pickova, J. (2008). Influence of hempseed cake and soybean meal on lipid fractions in bovine M. longissimus dorsi. ACTA Agriculturae Scandinavia, Section A 58, 152-160. II. Bernes, G., Turner, T., Pickova, J. (2010). Sheep fed only silage or supplemented with concentrates. 2. Effect on lamb performance and fatty acid profile. (manuscript). III. Turner, T., McNiven, M.A. (2010). In vitro N degradability and N digestibility of raw, roasted and extruded canola, linseed and soybean. (manuscript). IV. Turner, T., Pickova, J., Duynisveld, J., Doran, O., McNiven, M.A. (2010). Δ5- and Δ6- desaturase protein expression in two bovine muscles as influenced by dietary n-6/n-3 ratio in feedlot steers fed processed oilseeds. (manuscript).
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7467-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:fatty acids, lipids, proximate composition, ruminants, feeds, oilseeds, supplementary feeding, milk, meat, nutritive value
Keywords:Δ5-desaturase, Δ6-desaturase, MUFA, n-6/n-3 ratio, oilseeds, PUFA, processing, SFA
Permanent URL:
ID Code:2335
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Tyler Turner
Deposited On:27 Aug 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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