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http://dx.doi.org/10.5713/ajas.20.0261

Genetic relationship between purebred and synthetic pigs for growth performance using single step method  

Hong, Joon Ki (National Institute of Animal Science, Rural Development Administration)
Cho, Kyu Ho (National Institute of Animal Science, Rural Development Administration)
Kim, Young Sin (National Institute of Animal Science, Rural Development Administration)
Chung, Hak Jae (National Institute of Animal Science, Rural Development Administration)
Baek, Sun Young (National Institute of Animal Science, Rural Development Administration)
Cho, Eun Seok (National Institute of Animal Science, Rural Development Administration)
Sa, Soo Jin (National Institute of Animal Science, Rural Development Administration)
Publication Information
Animal Bioscience / v.34, no.6, 2021 , pp. 967-974 More about this Journal
Abstract
Objective: The objective of this study was to estimate the genetic correlation (rpc) of growth performance between purebred (Duroc and Korean native) and synthetic (WooriHeukDon) pigs using a single-step method. Methods: 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 WooriHeukDon 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. Results: 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 WooriHeukDon pigs was nearly 1. Comparison between different traits revealed that RFI in Duroc pigs was associated with different traits in WooriHeukDon pigs. However, the most of rpc between different traits were estimated with low or with high standard deviation. Conclusion: The results indicated that there were substantial differences in rpc of traits in the synthetic WooriHeukDon pigs, which could be caused by these pigs having a more complex origin than other crossbred pigs. RFI was strongly correlated between Duroc and WooriHeukDon 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 target traits.
Keywords
Synthetic Pigs; Genetic Correlation; WooriHeukDon; Residual Feed Intake; Growth;
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