Genome-Wide Association Study Identifies Novel Loci Associated with Feed Efficiency Traits in Hu Lambs

Strategic Insights -

Research conducted by a team of scientists from Lanzhou University has identified key genetic variants associated with feed efficiency traits in sheep. The study, published in the Journal of Integrative Agriculture, sheds light on the underlying genetic mechanisms that impact profitability in intensive sheep production. Feed efficiency is a crucial economic trait that significantly impacts profitability, and can be evaluated by the residual feed intake (RFI) and feed conversion ratio (FCR).

Key Takeaways:

  • The study analyzed the phenotype statistics and correlation analysis of 1,280 Hu sheep, revealing a large variation for feed-related traits and a significant positive correlation between RFI, average daily feed intake (ADFI), and FCR.
  • Genome-wide association study (GWAS) was conducted using whole-genome resequencing data to investigate the genetic associations of ADFI, FCR, and RFI, with 2 and 1 single nucleotide polymorphisms (SNPs) exceeding the genome-wide significance threshold for ADFI and FCR traits, respectively.
  • For RFI traits, only 4 SNPs exceeded the suggestive significance threshold.
  • Eight genes (LOC101121953, LOC101110202, CTNNA3, IZUMO3, PPM1E, YIPF7, ZSCAN12, and LOC105603808) were identified as potential candidate genes for FE-related traits.
  • The research concluded that these findings will provide valuable reference data and key genetic variants for effectively selecting feed-efficient individuals in sheep breeding programs.

Statistics:

  • 1,280 Hu sheep were analyzed in the study.
  • 2 and 1 single nucleotide polymorphisms (SNPs) exceeded the genome-wide significance threshold for ADFI and FCR traits, respectively.
  • 4 SNPs exceeded the suggestive significance threshold for RFI traits.
  • 8 genes were identified as potential candidate genes for FE-related traits.
  • The study demonstrated that 2 candidate SNPs associated with RFI were not significantly associated with growth traits (P > 0.05), but significantly related to RFI traits (P < 0.05).

Sources:

  • Genome-wide Association Study Identifies Novel Loci Associated With Feed Efficiency Traits In Hu Lambs. Journal of Integrative Agriculture, 2025;24(4):1259-1269.
  • Elsevier Sci Ltd. Contact information: 125 London Wall, London, England. (Elsevier - www.elsevier.com; Journal of Integrative Agriculture - www.journals.elsevier.com/journal-of-integrative-agriculture/)
  • Lanzhou University, Ministry of Agriculture and Rural Affairs, State Key Lab Herbage Improvement & Grassland Agro, Engn Res Ctr Grassland Ind, Ministry of Education, Coll Pastor, Lanzhou 730020, People's Republic of China.