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Association analysis for feed efficiency traits in beef cattle using preserved haplotypes.

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This study identified key beef cattle genome regions and haplotypes linked to average daily gain, dry matter intake, and residual feed intake. These findings aid in understanding cattle genetics and improving production traits.

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Area of Science:

  • Genomics
  • Animal Breeding
  • Quantitative Genetics

Background:

  • Understanding genetic factors influencing beef cattle production traits is crucial for selective breeding.
  • Genome-wide association studies (GWAS) are powerful tools for identifying genetic markers associated with complex traits.

Purpose of the Study:

  • To conduct a genome-wide scan to identify chromosome regions and haplotypes associated with average daily gain (ADG), dry matter intake (DMI), and residual feed intake (RFI) in beef cattle.
  • To investigate regions of recent selection and their association with production traits.

Main Methods:

  • Utilized data from Angus, Charolais, and crossbred beef cattle (n=1563).
  • Employed the Illumina Bovine SNP50 beadchip for genotyping.
  • Applied extended haplotype homozygosity (EHH) to detect selected regions and tested for associations with ADG, DMI, and RFI in crossbreds.

Main Results:

  • Identified six and eight chromosome regions significantly associated with traits at 5% and 10% false discovery rates, respectively.
  • Found 23 regions and 31 haplotypes significantly associated with at least one trait at nominal significance (P < 0.05).
  • Explained up to 13.50% (ADG), 9.92% (DMI), and 2.64% (RFI) of phenotypic variance; some haplotypes affected multiple traits.

Conclusions:

  • The identified genomic regions and haplotypes provide valuable insights into the genetic architecture of beef cattle production traits.
  • These findings contribute to the understanding of the beef cattle genome and can facilitate the identification of causative genes for improved breeding strategies.