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2025 Vol.52, Issue 3 Preview Page

Animal

Genetic analysis and genomic evaluation of marbling fineness in highly marbled Hanwoo steers
Shil Jin1*
,
Hyoun Ju Kim1
,
Jeong Il Won1
,
Sun Sik Jang1
,
Sung-Sik Kang1
,
Sung Woo Kim1
1Hanwoo Research Center, National Institute of Animal Science, Pyeongchang 25340, Korea
*Corresponding Author
1 September 2025. pp. 279-288
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Abstract

In this study, we evaluated marbling fineness (MF) in Hanwoo steers using the F7 index derived from image analysis and estimated genetic parameters along with four carcass traits: carcass weight (CWT), back fat thickness (BFT), eye muscle area (EMA), and marbling score (MS). Phenotypic and genomic data from 1,156 animals were analyzed using the multi-trait genomic best linear unbiased prediction (GBLUP) model. The heritability of MF was estimated at 0.441, indicating moderate-to-high genetic control. MF exhibited a strong genetic correlation (r = 0.639) with MS, suggesting shared genetic influences between these marbling-related traits. The correlation between MF phenotypes and genomic estimated breeding values (gEBVs) was significant (r = 0.769, p < 0.001), and the mean prediction accuracy based on prediction error variance (PEV) was 0.714—comparable to the accuracies of the four carcass traits. To further improve the genetic gain of MF, expansion of the national reference population, refinement of environmental modeling, and development of more precise genomic prediction methods are recommended. These results highlight the MF’s potential as a novel economic trait in Hanwoo cattle and its value as a selection criterion for future genomic breeding programs aimed at enhancing beef quality.

Keywords
genetic parameter
Hanwoo
heritability
marbling fineness
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Information
  • Publisher :Institute of Agricultural Science, Chungnam National University
  • Publisher(Ko) :충남대학교 농업과학연구소
  • Journal Title :Korean Journal of Agricultural Science
  • Journal Title(Ko) :농업과학연구
  • Volume : 52
  • No :3
  • Pages :279-288
  • Received Date : 2025-06-27
  • Revised Date : 2025-08-04
  • Accepted Date : 2025-08-05
  • DOI :https://doi.org/10.7744/kjoas.520307
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