Estimation of Environmental Effect and Genetic Parameters for The Carcass Traits in Hanwoo (Korean Cattle)

Abstract

This study aims to estimate the genetic parameters for carcass traits on Hanwoo of breeding farmhouses using Animal Products Grading Service's data of 428,812 cattle from 101 slaughterhouses nationwide from 2000 to 2005. Using carcass traits of carcass weight, eye muscle area, backfat thickness, marbling score, meat color and fat color that greatly influence Hanwoo's grade, the effects of carcass year, carcass season, sex and carcass region were estimated.Based upon carcass traits of carcass weight, eye muscle area, backfat thickness, marbling score and meat color that greatly influence Hanwoo's grade, the heritabilities and genetic parameters were estimated of 17,578 Hanwoo slaughtered in 2005 with existing herdbook, where EM-REML algorithm was used in estimating genetic parameters.The mean and standard deviation of each carcass trait are 321.42±53.62 kg, 76.25±10.43cm 2 , 9.96± 4.14mm, 3.75±2.00, 4.83±0.48 and 2.99±0.40, for carcass weight, eye muscle area, backfat thickness, marbling score, meat color and fat color, respectively. As a result of analysis on the effects of carcass year, the carcass weight, backfat thickness and meat color came out highest as 359.40±0.181, 9.82±0.017 and 4.90±0.002, respectively in 2004. As a result of analysis on the effects of carcass season, the carcass weight and eye muscle area came out highest as 345.88±0.144 and 79.57±0.033 respectively in spring, and the backfat thickness was highest as 8.78±0.013 in winter, and the meat color and fat color slightly came out higher as 4.88±0.002 and 2.96±0.001 in fall, while the marbling score was highest as 3.29±0.006 in summer. The results of the analysis on the effects of sex indicated that the backfat thickness and fat color were highest as 10.53±0.010 and 3.07±0.001 in cow, the carcass weight came out highest in Hanwoo steer as 368.03±0.068 kg, the eye muscle area were highest as 82.96±0.042 in bull, and the marbling score was highest as 4.19±0.007 in steer, and the meat color was highest as 4.89±0.001 in cow.Regarding the results of analysis on the effects of carcass region, the carcass weight, eye muscle area,

Estimation of breeding value and accuracy using pedigree and genotype of Hanwoo cows (Korean cattle)

“…Do et al (2016) reported the heritability of CWT, EMA, BFT and MS as 0.28, 0.23, 0.20 and 0.28 upon analysing the Hanwoo collected at Hanwoo Saupdan, which was lower than the results of this study. The previous research showed lower heritability compared to this study, andMoon et al (2009) reported that if pedigree management is inaccurate, the relationship coefficient within the group becomes lower, resulting in lower genetic parameter estimations Park et al (2013). reported the heritability of CWT, EMA, BFT and MS as 0.30, 0.42, 0.50 and 0.63 upon analysing the progeny test cattle, whilePark et al (2019) reported as 0.35, 0.44, 0.46 and 0.56, showing a similar parameter as in this study for EMA, BFT and MS, which led to the judgement that the test group used in this study had accurate pedigree management as do progeny test cattle.…”