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Related Experiment Video

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Genome scan for postmortem carcass traits in Nellore cattle.

G A Fernandes Júnior, R B Costa, G M F de Camargo

    Journal of Animal Science
    |November 30, 2016
    PubMed
    Summary

    This study identified key genomic regions and candidate genes influencing carcass traits like ribeye area, backfat thickness, and hot carcass weight in Nellore cattle. These findings aid in understanding genetic control and improving beef production through genomic selection.

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    Area of Science:

    • Animal Genetics
    • Genomics
    • Quantitative Genetics

    Background:

    • Carcass traits, including hot carcass weight (HCW), ribeye area (REA), and backfat thickness (BFT), are critical economic indicators in beef cattle production.
    • Understanding the genetic basis of these traits is essential for developing effective breeding programs.

    Purpose of the Study:

    • To identify genomic regions and candidate genes associated with carcass traits (REA, BFT, HCW) in Nellore cattle.
    • To leverage genomic information for potential improvements in beef cattle breeding.

    Main Methods:

    • Utilized a dataset of 1,756 Nellore males with phenotype records and 1,604 with both genotypic and phenotypic information.
    • Employed the single-step GBLUP approach with a genomic matrix re-weighting procedure to calculate SNP effects and genomic breeding values.
    • Analyzed variance explained by 100-SNP windows to pinpoint significant genomic regions.

    Main Results:

    • The top 10 SNP windows explained substantial genetic variance for REA (8.72%), BFT (11.38%), and HCW (9.31%).
    • Identified specific chromosomes harboring these significant regions for each trait (e.g., Chr 5, 7, 8 for REA; Chr 6, 8, 10 for BFT; Chr 4, 6, 7 for HCW).
    • Highlighted candidate genes related to cell cycle, amino acid transport (for REA), lipid metabolism (for BFT), and carcass weight (for HCW).

    Conclusions:

    • Several genomic regions with plausible candidate genes influencing carcass traits in Nellore cattle were identified.
    • These findings contribute to a deeper understanding of the genetic architecture of carcass traits.
    • The identified genes offer potential for future functional genomic studies and marker-assisted selection in beef cattle breeding programs.