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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0021    [Accepted] Published online October 21, 2019.
Effect of errors in pedigree on the accuracy of estimated breeding value for carcass traits in Korean Hanwoo cattle
Chiemela Peter Nwogwugwu1  , Yeongkuk Kim1  , Yun Ji Chung1  , Sung Bong Jang1  , Seung Hee Roh3  , Sidong Kim4  , Jun Heon Lee1  , Tae Jeong Choi4  , Seung Hwan Lee1,* 
1Division of Animal and Dairy Science, Chungnam National University, Daejeon 34134, Korea
2National Institute of Animal Science, Cheonan, 31000, Korea
3Hanwoo Improvement Center, National Agricultural Cooperative Federation, Seosan 31948, Korea
Correspondence:  Seung Hwan Lee, Tel: +82-42-821-5772, Fax: +82-42-821-5772, Email: slee46@cnu.ac.kr
Received: 9 January 2019   • Revised: 16 April 2019   • Accepted: 9 January 2019
Abstract
Objective
s: This study evaluated the effect of pedigree errors (PEs) on the accuracy of estimated breeding value (EBV) and genetic gain for carcass traits in Korean Hanwoo cattle.
Methods
The raw data set was based on the pedigree records of Korean Hanwoo cattle. The animals’ information was obtained using Hanwoo registration records from Korean animal improvement association database. The record comprised of 46,704 animals, where the number of the sires used was 1298 and the dams were 38,366 animals. The traits considered were carcass weight (CWT), eye muscle area (EMA), back fat thickness (BFT), and marbling score (MS). Errors were introduced in the pedigree dataset through randomly assigning sires to all progenies. The error rates substituted were 5, 10, 20, 30, 40, 50, 60, 70 and 80%, respectively. A simulation was performed to produce a population of 1650 animals from the pedigree data. A REML based animal model was applied to estimate the EBV, accuracy of the EBV, expected genetic gain, variance components, and heritability (h2) estimates for carcass traits. Correlation of the simulated data under PEs was also estimated using Pearson’s method.
Results
The results showed that the carcass traits per slaughter year were not consistent. The average CWT, EMA, BFT, and MS were 342.60 kg, 78.76 cm2, 8.63 mm, and 3.31, respectively. When errors were introduced in the pedigree, the accuracy of EBV, genetic gain and h2 of carcass traits was reduced in this study. In addition, the correlation of the simulation was slightly affected under PEs.
Conclusion
This study reveals the effect of PEs on the accuracy of EBV and genetic parameters for carcass traits, which provides valuable information for further study in Korean Hanwoo cattle.
Keywords: Breeding Value; Carcass Traits; Genetic Gain; Hanwoo Cattle; Heritability


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