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Quality of muscle foods

effects of feed and storage time

Li, Shengjie (2016). Quality of muscle foods. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2016:18
ISBN 978-91-576-8538-4
eISBN 978-91-576-8539-1
[Doctoral thesis]

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Abstract

The overall aim of this thesis was to investigate the effects of feed and storage time on meat quality.

To study the effect of feed, chicken were fed seven steam-pelleted or nonpelleted rapeseed (RS) diets with different RS inclusion levels (0, 80, 160, and 240 g/kg) for 34 days, and the dietary effects on meat yield, fatty acid composition in meat, and the expression of lipid metabolism-related genes in liver were determined. Feeding with steam-pelleted diets with high inclusion of RS (160 or 240 g/kg) significantly increased the content of n-3 long chain polyunsaturated fatty acids (n-3 LC-PUFA) in meat, without compromising the meat yield and total fatty acid content. The increased intake of α-linolenic acid enabled higher conversion into n-3 LC-PUFA. Therefore, feeding broiler chicken steam-pelleted diet with high RS inclusion can be a feasible strategy to increase human intake of n-3 LC-PUFA without compromising meat yield.

The effect of storage time on meat color, microbial growth, and lipid oxidation was studied on beef steaks from Longissimus thoracis et lumborum muscles overwrapped with polyvinyl chloride (PVC) film and stored at 4°C for 0, 4, 7, and 10 days. Microbial spoilage of beef occurred at day 10 as indicated by the total viable count exceeding the threshold of 7 log10 CFU/cm². Pseudomonas spp. and Brochothrix spp. were the prevailing bacteria species when meat was spoiled. Moreover, Terminal Restriction Fragment Length Polymorphism (T-RFLP) analysis showed the successive changes in the incidences of different bacteria over time. At day 10, the a* and Chroma decreased and hue angle increased significantly, indicating meat discoloration. Concentrations of spermine, tyramine, and cadaverine were found to be potential spoilage indicators of meat freshness. Lipid oxidation occurred only slightly, which could be attributed to the high content of α-tocopherol in meat. In contrast, the degree of lipid lipolysis increased with storage time as reflected by the increase in the relative content of free fatty acids and decrease in relative content of triacylglycerols.

Authors/Creators:Li, Shengjie
Title:Quality of muscle foods
Subtitle:effects of feed and storage time
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2016
Depositing date:19 February 2016
Volume:2016:18
Number of Pages:58
Papers/manuscripts:
NumberReferences
ILi, S., Schiller Vestergren, A., Wall, H., Trattner, S. & Ivarsson, E. (2016). Feeding steam-pelleted rapeseed affects expression of genes involved in hepatic lipid metabolism and the fatty acid composition of chicken meat (manuscript).
IILi, S., Zamaratskaia, G., Roos, S., Båth, K., Meijer, J., Borch, E. & Johansson, M. (2015). Inter-relationships between the metrics of instrumental meat color and microbial growth during aerobic storage of beef at 4°C. Acta Agriculturae Scandinavica Section A-Animal Science (accepted, DOI:10.1080/09064702.2015.1072579).
IIILi, S., Johansson, M., Vidanarachchi, J. K., Pickova, J. & Zamaratskaia, G. (2016). Determination of biogenic amines in beef stored aerobically by high performance thin layer chromatography densitometry (manuscript).
IVLi, S., Pickova, J., Vidanarachchi, J. K., Johansson, M. & Zamaratskaia, G. (2016). Lipolytic and oxidative changes in fresh beef during aerobic storage at 4°C (manuscript).
Place of Publication:Uppsala
Publisher:Department of Food Science, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8538-4
ISBN for electronic version:978-91-576-8539-1
ISSN:1652-6880
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
Q Food science > Q54 Feed composition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
Agrovoc terms:chickens, cattle, chicken meat, beef, meat quality, proximate composition, polyunsaturated fatty acids, colour, feeds, rapeseed, gene expression, lipolysis
Keywords:n-3 LC-PUFA, rapeseed, discoloration, microbial growth, biogenic amine, lipolysis, lipid oxidation
URN:NBN:urn:nbn:se:slu:epsilon-e-3236
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3236
ID Code:13082
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Food Science (until 161231)
External funders:Värmeforsk (Stiftelsen för värmeteknisk forskning)
Deposited By: Mr. Shengjie Li
Deposited On:22 Feb 2016 09:54
Metadata Last Modified:03 Mar 2016 18:48

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