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Fatty acids, tocopherols and lipid oxidation in pig muscle

effects of feed, sex and outdoor rearing

Högberg, Anders (2002). Fatty acids, tocopherols and lipid oxidation in pig muscle. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 328
ISBN 91-576-6166-9
[Doctoral thesis]

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Abstract

The objective of this thesis was to investigate the effect of rearing conditions, sex, and RN genotype on the fatty acid composition in polar and neutral lipids, content of antioxidants, and lipid oxidation in pig muscle. Furthermore, the effect of different dietary levels of various polyunsaturated fatty acids (PUFA) on rat performance was investigated. Pigs were reared in outdoor or indoor rearing systems and fed different diets of conventional and organic origin. All pigs were slaughtered at approximately 105 kg live weight and samples were collected from M. longissimus dorsi and M. Biceps femoris for lipid analysis. Outdoor rearing increased the level of PUFA n-3 in the neutral lipids of pig muscle. The increase was rather small and the effect on oxidative stability can be considered as minor, especially as outdoor pigs had a higher content of tocopherols. In addition, our studies showed a more pronounced increase of PUFA level in females and entire males, due to diet and outdoor rearing, compared with castrated males. This difference in PUFA level is suggested to depend on grazing behaviour, incorporation of PUFA into fat tissues or a slight alteration of PUFA metabolism, possibly mediated by light. The level of PUFA in neutral lipids was higher in entire males compared with females and castrated males, which can partly be explained by lower body fat accumulation. In polar lipids the level of highly unsaturated fatty acids was higher in entire male and female pigs compared with castrated males, which indicates that the desaturation and elongation of PUFA are more pronounced in sexes with an intact reproductive function. The RN genotype was found to influence the fatty acid composition in the polar lipids of pig muscle suggesting involvement of PUFA in glycogen metabolism or that the RN genotype itself affects PUFA metabolism. Finally, feeding rats for approximately 39 days with linseed oil or sunflower oil diet improved wound healing. There was a positive correlation between PUFA n-3 fatty acids in liver and wound healing. Thus, the higher levels of PUFA in tissues covariating with the diet and the demonstrated increased wound healing, revealed a potential of PUFA in affecting the performance of animals.

Authors/Creators:Högberg, Anders
Title:Fatty acids, tocopherols and lipid oxidation in pig muscle
Subtitle:effects of feed, sex and outdoor rearing
Year of publishing :April 2002
Volume:328
Number of Pages:63
Papers/manuscripts:
NumberReferences
ALLI. Högberg, A., Pickova, J., Dutta, P.C., Babol, J., and Bylund A.C. 2001. Effect of rearing system on muscle lipids of gilts and castrated male pigs. Meat Science 58, 223-229. II. Högberg, A., Pickova, J., Babol, J., Andersson, K. and Dutta, P. C. 2002. Muscle lipids, vitamins E and A, and lipid oxidation as affected by diet and RN genotype in female and castrated male Hampshire crossbred pigs. Meat Science 60, 411-420. III. Högberg, A., Pickova, J., Andersson, K. and Lundström K. 2002. Fatty acid composition and tocopherol content of muscle in pigs fed organic and conventional feed with different n6/n3 ratios respectively. Food Chemistry (submitted) IV. Högberg, A., Pickova, J. Stern, S., Lundström, K. and Bylund. A.C. Fatty acid composition and tocopherol concentrations in muscle of entire male, castrated male and female pigs, reared in an indoor or outdoor housing system. (Manuscript)
Place of Publication:Uppsala
ISBN for printed version:91-576-6166-9
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
Q Food science > Q04 Food composition
Subjects:Not in use, please see Agris categories
Agrovoc terms:tocopherols, antioxidants, polyunsaturated fatty acids, lipids, oxidation, swine, meat, proximate composition, animal husbandry, animal feeding
Keywords:Castrated male pigs, Entire male pigs, Female pigs, Lipid oxidation, Neutral lipids, Polar lipids, Pork, PUFA, Rearing condition, RN genotype
URN:NBN:urn:nbn:se:slu:epsilon-335
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-335
ID Code:248
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Staff Epsilon
Deposited On:23 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:03

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