Selection for intramuscular fat and lean meat yield will improve the bloomed colour of Australian lamb loin meat

Calnan, H.B.; Jacob, R.H.; Pethick, D.W.; Gardner, G.E.

doi:10.1016/j.meatsci.2017.05.001

Cited by 31 publications

(18 citation statements)

References 33 publications

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“…The genetic correlations for live weight with the other meat quality traits tended to be negligible, which was consistent with reported genetic correlations for meat color (Fogarty et al, 2003;Greeff et al, 2008;Mortimer et al, 2010;Brito et al, 2015Brito et al, , 2017, IMF (Brien et al, 2013, an earlier multibreed sampling of the IN progeny; Mortimer et al, 2010), and shear force (Brien et al 2013;Brito et al, 2015Brito et al, , 2017. Also, no effect has been observed of sire pwWT EBV on meat color (Calnan et al, 2017), except L* (Hopkins et al, 2005), or IMF (Hopkins et al, 2007a;Pannier et al, 2014c;Anderson et al, 2015) and shear force (Hopkins et al, 2005;Allingham et al, 2006). However, low-positive genetic correlation between shear force and live weight at later ages may exist as shown by the present study and reported by Mortimer et al (2010).…”

Section: Live Weight Traitssupporting

confidence: 82%

“…There tended to be also generally low to moderate positive genetic correlations for FATUS and EMDUS with Myo (0.25 ± 0.24 to 0.43 ± 0.14) and cfa* (−0.06 ± 0.36 to 0.57 ± 0.35), and negative with cfL* (−0.05 ± 0.26 to −0.52 ± 0.31). Genetic correlation estimates for these traits from other studies are variable (Greeff et al, 2008;Mortimer et al, 2010;Brito et al, 2015Brito et al, , 2017, with sire EBV for the ultrasound traits having no (Gardner et al, 2006) to a small positive (Kelman et al, 2014) effect on Myo and no (Hopkins et al 2005(Hopkins et al , 2007b to small effects on the meat color traits (positive of muscle depth on redness, and negative of fat depth on redness and lightness in Merinos; Calnan et al, 2017). However, our results suggest that selection to increase FATUS and EMDUS in Merinos may result in increased Myo and meat redness (cfa*), but decreased meat brightness (cfL*), although any correlated changes would be small.…”

Section: Ultrasound and Meat Quality Traitsmentioning

confidence: 99%

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Genetic correlations between meat quality traits and growth and carcass traits in Merino sheep1

Mortimer

Fogarty

Werf

et al. 2018

Journal of Animal Science

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Genetic correlations between 16 meat quality and nutritional value traits and live weight at various ages, ultrasound fat and muscle depth, carcass measures and carcass dissection traits were estimated for Merino sheep in the Information Nucleus (IN). Genetic correlations between live weight at various ages and the carcass traits are also reported. The IN comprises 8 genetically linked flocks managed across a range of Australian sheep environments. Meat quality traits included between 1,200 and 1,300 records for progeny from over 170 sires for intramuscular fat (IMF), lean meat yield (LMY), shear force (SF5), pH, meat color and meat nutritional value traits including iron and zinc levels and long chain omega-3 and omega-6 polyunsaturated fatty acid levels. The genetic correlations indicated that selection of Merino sheep to either reduce fat or increase muscle using ultrasound assessments will result in little change in IMF and SF5. Myoglobin levels would tend to be reduced following selection for reduced ultrasound fat depth (0.35 ± 0.21, 0.43± 0.14), whereas increases in myoglobin levels would occur due to selection for increased ultrasound muscle depth (0.25 ± 0.24, 0.38 ± 0.15). Selection for increased live weight will result in favorable correlated responses in hot carcass weight (0.76 to 0.97), dressing percentage (0.13 to 0.47) and carcass muscle (0.37 to 0.95), but unfavourable responses of increases in carcass fatness (0.13 to 0.65) and possible small reductions in muscle oxidative activity (-0.13 ± 0.14 to -0.73 ± 0.33) and iron content (-0.14 ± 0.15 to -0.38 ± 0.16), and a possible deterioration of shear force from selection at later ages (0.15 ± 0.26, 0.27 ± 0.24). Negligible changes are generally expected for LMY and meat color traits following selection for increased live weight (most genetic correlations less than 0.20 in size). Selection for increased LMY would tend to result in unfavorable changes in several aspects of meat quality, including reduced IMF (-0.27 ± 0.18), meat tenderness (0.53 ± 0.26) and meat redness (-0.69 ± 0.40), as well as reduced iron levels (-0.25 ± 0.22). These genetic correlations are a first step in assisting the development of breeding values for new traits to be incorporated into genetic evaluation programs to improve meat production from Merino sheep and other dual purpose sheep breeds.

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Section: Live Weight Traitssupporting

confidence: 82%

Section: Ultrasound and Meat Quality Traitsmentioning

confidence: 99%

Genetic correlations between meat quality traits and growth and carcass traits in Merino sheep1

Mortimer

Fogarty

Werf

et al. 2018

Journal of Animal Science

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“…A large number of studies have reported quantitative trait loci (QTLs) that affect different fat deposition sites in different strains and experimental populations. Theoretically, genes involved in lipid metabolism have potential regulatory effects on intramuscular fat content 22 . However, there are few reports on intramuscular fat related molecular markers (DNA maker) 23 .…”

Section: Discussionmentioning

confidence: 99%

Different expression of lipid metabolism-related genes in Shandong black cattle and Luxi cattle based on transcriptome analysis

Liu

Bai

et al. 2020

Sci Rep

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To provide new ideas for improving meat quality and generating new breeds of cattle, the important candidate genes affecting fat deposition in two kinds of cattle were identified. Eighteen months Shandong black cattle (n = 3) and Luxi cattle (n = 3) were randomly assigned into two environmental. The longissimus dorsi muscles of Shandong Black Cattle and Luxi Cattle were collected and analyzed by fatty acid determination, high-throughput sequencing transcriptomics, qRT-PCR expression profile and western blot. The ratio of unsaturated fatty acids to saturated fatty acids was 1.37:1 and 1.24:1 in the muscle tissues of Shandong black cattle and Luxi cattle, respectively. The results of RNA-Seq analysis revealed 1320 DEGs between the longissimus dorsi of Shandong black cattle and Luxi cattle. A total of 867 genes were upregulated, and the other 453 genes were downregulated. With GO enrichment analysis, it was found that the identified DEGs were significantly enriched in regulation of the Wnt signaling pathway, negative regulation of the Wnt signaling pathway, cAMP metabolic process, fat cell differentiation and among other functions. We found that regulation of lipolysis in adipocytes was the significant enrichment pathway of upregulated genes and downregulated genes, PPAR signaling pathway and AMPK signaling pathway are highly representative pathways of lipid metabolism in Shandong black cattle. Network analysis showed that PPARGC1A, ADCY4, ANKRD6, COL1A1, FABP4, ADIPOQ, PLIN1, PLIN2, and LIPE genes were correlated with key loci genes in multiple metabolic pathways. Meanwhile we found that FABP4 and ADIPOQ had 7 common regulatory factors in different genes, which were PLIN1, PLIN2, PPARGC1A, RXRA, PCK1, LEPR, LEP. These genes were involved in regulation of lipolysis in adipocytes, adipocytokine signaling pathway, PPAR signaling pathway. FABP4 and ADIPOQ were selected as important candidate marker genes for fat deposition based on the results.

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“…Studies with lamb have shown that carcass intramuscular fat deposition and FA composition account for eating quality variation [198,199]. Consumption of lamb IMF is important to humans since it helps with the delivery and absorption of fat-soluble vitamins, and exerts positive effects on immune response [200] as exemplified by Calder's work [58] demonstrating the relationship between fatty acid composition of immune cells and their function. Marbling score to date remains one of the most important traits and reason why carcass evaluation is carried out in the abattoir [201].…”

Section: Meat Eating Qualitymentioning

confidence: 99%

Genetics of Omega-3 Long-Chain Polyunsaturated Fatty Acid Metabolism and Meat Eating Quality in Tattykeel Australian White Lambs

Pewan

Otto

Huerlimann

et al. 2020

Genes

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Meat eating quality with a healthy composition hinges on intramuscular fat (IMF), fat melting point (FMP), tenderness, juiciness, flavour and omega-3 long-chain polyunsaturated fatty acids (n-3 LC-PUFA) content. These health-beneficial n-3 LC-PUFA play significant roles in optimal cardiovascular, retinal, maternal and childhood brain functions, and include alpha linolenic (ALA), eicosapentaenoic (EPA), docosahexaenoic (DHA) and docosapentaenoic (DPA) acids. The primary objective of this review was to access, retrieve, synthesise and critically appraise the published literature on the synthesis, metabolism and genetics of n-3 LC-PUFA and meat eating quality. Studies on IMF content, FMP and fatty acid composition were reviewed to identify knowledge gaps that can inform future research with Tattykeel Australian White (TAW) lambs. The TAW is a new sheep breed exclusive to MARGRA brand of lamb with an outstanding low fat melting point (28–39°C), high n-3 LC-PUFA EPA+DHA content (33–69mg/100g), marbling (3.4–8.2%), tenderness (20.0–38.5N) and overall consumer liking (7.9–8.5). However, correlations between n-3 LC-PUFA profile, stearoyl-CoA desaturase (SCD), fatty acid binding protein 4 (FABP4), fatty acid synthase (FASN), other lipogenic genes and meat quality traits present major knowledge gaps. The review also identified research opportunities in nutrition–genetics interactions aimed at a greater understanding of the genetics of n-3 LC-PUFA, feedlot finishing performance, carcass traits and eating quality in the TAW sheep. It was concluded that studies on IMF, FMP and n-3 LC-PUFA profiles in parental and progeny generations of TAW sheep will be foundational for the genetic selection of healthy lamb eating qualities and provide useful insights into their correlations with SCD, FASN and FABP4 genes.

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Selection for intramuscular fat and lean meat yield will improve the bloomed colour of Australian lamb loin meat

Cited by 31 publications

References 33 publications

Genetic correlations between meat quality traits and growth and carcass traits in Merino sheep1

Genetic correlations between meat quality traits and growth and carcass traits in Merino sheep1

Different expression of lipid metabolism-related genes in Shandong black cattle and Luxi cattle based on transcriptome analysis

Genetics of Omega-3 Long-Chain Polyunsaturated Fatty Acid Metabolism and Meat Eating Quality in Tattykeel Australian White Lambs

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