Naserkheil Masoumeh, Lee Deuk-Hwan, Kong Hong-Sik, Seong Jiyeon, Mehrban Hossein
Department of Animal Science, University College of Agriculture and Natural Resources, University of Tehran, Karaj 77871-31587, Iran.
Department of Animal Life and Environment Sciences, Hankyong National University, Jungang-ro 327, Anseong-si 17579, Korea.
Animals (Basel). 2021 May 16;11(5):1425. doi: 10.3390/ani11051425.
Genetic parameters have a significant role in designing a breeding program and are required to evaluate economically important traits. The objective of this study was to estimate heritability and genetic correlation between yearling ultrasound measurements, such as backfat thickness (UBFT), eye muscle area (UEMA), intramuscular fat content (UIMF), and carcass traits, such as backfat thickness (BFT), carcass weight (CW), eye muscle area (EMA), marbling score (MS) at approximately 24 months of age, as well as yearling weight (YW) in Hanwoo bulls (15,796) and steers (5682). The (co) variance components were estimated using a multi-trait animal model. Moderate to high heritability estimates were obtained and were 0.42, 0.50, 0.56, and 0.59 for CW, EMA, BFT, and MS, respectively. Heritability estimates for yearling measurements of YW, UEMA, UBFT, and UIMF were 0.31, 0.32, 0.30, and 0.19, respectively. Favorable and strong genetic correlations were observed between UIMF and MS (0.78), UBFT and BFT (0.63), and UEMA and EMA (0.65). Moreover, the estimated genetic correlation between YW and CW was high (0.84) and relatively moderate between YW and EMA (0.43). These results suggest that genetic improvement can be achieved for carcass traits when using yearling ultrasound measurements as selection criteria in ongoing Hanwoo breeding programs.
遗传参数在设计育种计划中具有重要作用，并且是评估经济重要性状所必需的。本研究的目的是估计周岁超声波测量值之间的遗传力和遗传相关性，这些测量值包括背膘厚度（UBFT）、眼肌面积（UEMA）、肌内脂肪含量（UIMF），以及胴体性状，如大约24月龄时的背膘厚度（BFT）、胴体重（CW）、眼肌面积（EMA）、大理石花纹评分（MS），还有韩牛公牛（15796头）和阉牛（5682头）的周岁体重（YW）。使用多性状动物模型估计（协）方差分量。获得了中等至高的遗传力估计值，CW、EMA、BFT和MS的遗传力估计值分别为0.42、0.50、0.56和0.59。YW、UEMA、UBFT和UIMF周岁测量值的遗传力估计值分别为0.31、0.32、0.30和0.19。在UIMF和MS（0.78）、UBFT和BFT（0.63）以及UEMA和EMA（0.65）之间观察到有利且强的遗传相关性。此外，YW和CW之间的估计遗传相关性较高（0.84），YW和EMA之间的遗传相关性相对中等（0.43）。这些结果表明，在正在进行的韩牛育种计划中，将周岁超声波测量值用作选择标准时，可以实现胴体性状的遗传改良。
