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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0136    [Accepted] Published online August 3, 2019.
Estimation of environmental effects and genetic parameters of carcass traits on Chikso (Korean Brindle Cattle)
Byoungho Park2  , Tae Jeong Choi2  , Mi Na Park2,*  , Sang-Hyon Oh1,* 
1National Institute of Animal Science, RDA, Cheonan, 31000, Korea
2Department of Agriculture, Food, and Resource Sciences, University of Maryland Eastern Shore, Princess Anne, MD 21853, USA
Correspondence:  Mi Na Park,Email: mina0412@korea.kr
Sang-Hyon Oh, Tel: +1-410-651-7572, Fax: +1-410-651-7931, Email: shoh@umes.ude
Received: 17 February 2019   • Revised: 16 May 2019   • Accepted: 16 July 2019
The purpose of this study was 1) to identify the characteristics of carcass traits in Chikso by gender, region, age at slaughter, and coat color using the carcass data collected from the nationwide pedigree information and coat color investigation, and 2) to estimate genetic parameters for breed improvement.
The linear model was used to analyze the environmental effects on the carcass traits and to estimate genetic parameters. Analysis of variance was performed using TYPE III sum of squares for the unbalanced data provided by the GLM procedure. Variance components for genetic parameters was estimated using REMLF90 of the BLUPF90 family programs.
Phenotypic performance of carcass weight(CW), eye muscle area(EMA), and backfat thickness(BF) in Chikso were lower than those of Hanwoo. This is a natural outcome because Hanwoo has met significant efforts for improvement at the national level, a phenomenon not observed in Chikso. Another factor influencing the above outcome was the smaller population size of Chikso compared to that of Hanwoo’s. The heritabilities of carcass weight(CW), eye muscle area(EMA), backfat thickness(BF) and marbling score(MS) in Chikso were estimated as 0.50, 0.37, 0.35 and 0.53, respectively, which were was higher than those of Hanwoo.
Based on the genetic parameters that were estimated in this study, it is expected that the carcass traits will improve when the livestock research institutes at each province conduct small-scale performance tests and the semen is provided to farmers after selecting proven bulls using the state-of-art selection technique such as genomic selection.
Keywords: Heritability; Genetic Correlation; Carcass Traits; Chikso; Korean Brindle Cattle

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