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DOI: https://doi.org/10.5713/ajas.20.0261    [Accepted] Published online August 30, 2020.
Genetic relationship between purebred and synthetic pigs for growth performance using single step method
Joon Ki Hong1  , Kyu Ho Cho1  , Young Sin Kim1  , Hak Jae Chung1  , Sun Young Baek1  , Eun Seok Cho1,*  , Soo Jin Sa1,* 
National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Korea
Correspondence:  Eun Seok Cho, Tel: +82-31-290-1674, Fax: +82-31-290-1602, Email: segi0486@korea.kr
Soo Jin Sa,Email: soojinsa@korea.kr
Received: 24 April 2020   • Revised: 24 June 2020   • Accepted: 21 August 2020
The objective of this study was to estimate the genetic correlation (rpc) of growth performance between purebred (Duroc and Korean native) and synthetic (Woori black) pigs using a single-step method.
Phenotypes of 15,902 pigs with genotyped data from 1,792 pigs from a nucleus farm were used for this study. We estimated the rpc of several performance traits between Woori black and purebred pigs: day of target weight (DAY), backfat thickness (BF), feed conversion rate (FCR), and residual feed intake (RFI). The variances and covariances of the studied traits were estimated by an animal multi-trait model that applied the Bayesian inference.
rpc within traits was lower than 0.1 for DAY and BF, but high for FCR and RFI; in particular, rpc for RFI between Duroc and Woori black pigs was nearly 1. Comparison between different traits revealed that RFI in Duroc pigs was associated with different traits in Woori black pigs. However, the most of rpc between different traits were estimated with very low or with high standard deviation.
The results indicated that there were substantial differences in rpc of traits in the synthetic Woori black pigs, which could be caused by these pigs having a more complex origin than other crossbred pigs. RFI was strongly correlated between Duroc and Woori black pigs, and these breeds might have similar single nucleotide polymorphism effects that control RFI. RFI is more essential for metabolism than other growth traits and these metabolic characteristics in purebred pigs, such as nutrient utilization, could significantly affect those in synthetic pigs. The findings of this study can be used to elucidate the genetic architecture of crossbred pigs and help develop new breeds with particular target traits.
Keywords: Synthetic Pigs; Genetic Correlation; Woori Black; Residual Feed Intake; Growth

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