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Genetic and ageing effects on beef quality

Li, Xin (2013). Genetic and ageing effects on beef quality. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2013:7
ISBN 978-91-576-7764-8
[Doctoral thesis]

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The overall aim of this thesis was to investigate genetic and ageing effects on beef quality.

To study the genetic effects, association analyses were carried out between single nucleotide polymorphisms (SNPs) at DGAT1, LEP, SCD1, CAPN1 and CAST genes with colour, marbling, water holding capacity (WHC) and tenderness in meat from young bulls of the beef cattle population in Sweden. In total 243 young bulls from five beef breeds were included in the analysis. The results confirmed previously reported associations of the K232A polymorphism in the DGAT1 gene with marbling and polymorphisms in CAPN1 and CAST genes with meat tenderness. The LEP, SCD1 and CAPN1 genes showed association with meat colour traits. Our results confirm that part of the variation in these beef quality traits is under genetic control. Although our analyses revealed only minor breed differences, the lack of consistent gene effects between studies with different breeds indicate that association between markers and traits may not be consistent over breeds, possibly due to different genomic background. This may have implications on the applicability across populations of SNP chips developed in only one or a few breeds.

To assess the ageing effects, three ageing methods, dry ageing bag, vacuum ageing and traditional dry ageing were compared. The beef muscles longissimus thoracis et lumborum and gluteus medius were used for the ageing process. The results showed that the dry ageing bag, as an alternative to traditional unpackaged dry ageing, made it possible to decrease meat ageing loss and microbial growth compared with traditional dry ageing. Meat aged in dry ageing bags has similar sensory characteristics as traditional dry ageing for most of the sensory attributes. Compared with vacuum ageing, the total product yield was lower after ageing meat in dry ageing bags. However, the dry ageing bags produced meat with enhanced tenderness and juiciness, characteristics that are valued by consumers. Thus, by using dry ageing bags it is possible to produce dry-aged meat under more controlled conditions without negative effects on sensory or other quality attributes.

Authors/Creators:Li, Xin
Title:Genetic and ageing effects on beef quality
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :January 2013
Number of Pages:60
I.Li, X., Ekerljung, M., Lundström, K., Lundén, A. Association of polymorphisms at DGAT1, leptin, SCD1, CAPN1 and CAST genes with colour, marbling and water holding capacity in meat from beef cattle populations in Sweden (submitted).
II.Ekerljung, M., Li, X., Lundén, A., Lundström, K., Marklund, S., Näsholm, A. (2012). Associations between candidate SNPs in the calpain 1, calpastatin and leptin genes and meat tenderness among Swedish beef populations. Acta Agriculturae Scandinavica Section A-Animal Science (accepted).
III.Li, X., Babol, J., Bredie, W. L. P., Nielsen, B., Tománková, J., Lundström, K. A comparative study of beef quality after ageing longissimus muscle using a dry ageing bag, traditional dry ageing or vacuum packing (submitted).
IV.Li, X., Babol, J., Wallby, A., Lundström, K. Meat quality, microbiological status and consumer preference of beef gluteus medius aged in a dry ageing bag or vacuum (submitted).
Place of Publication:Uppsala
Publisher:Dept. of Food Science, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7764-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L10 Animal genetics and breeding
Q Food science > Q04 Food composition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Food Science
Agrovoc terms:beef, meat quality, bulls, beef cattle, breeds (animals), genes, genetic polymorphism, vacuum drying, ripening, tenderness
Keywords:Beef quality, Single nucleotide polymorphism, Dry ageing, Vacuum
Permanent URL:
ID Code:9374
Department:(NL, NJ) > Dept. of Food Science (until 161231)
Deposited By: Xin Li
Deposited On:10 Jan 2013 08:11
Metadata Last Modified:02 Dec 2014 10:54

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