Whole‐genome analysis reveals the hybrid formation of Chinese indigenous DHB pig following human migration

Abstract

Qiu et al., 2012). Adaptive introgression can also occur between wild animals and domesticated breeds (Scheu et al., 2015;vonHoldt et al., 2010). Cao et al. (2021) found that introgression of wild sheep into domesticated sheep contributed to improving the ability of domestic sheep to resist pneumonia. Although many adaptive introgressions are related to environmental challenges, human-mediated genetic introgression among pig populations is well documented in commercial breeding. Chinese indigenous pigs, such as Meishan, have contributed to European pig breeds since the nineteenth century (Rothschild et al., 1996; Zhao et al., 2018). Bosse et al. (2015) found that beneficial haplotype allele within the AHR locus from Asian pigs was favored via artificial selection after introgression and has played an important role in increasing sow fertility in European pigs.China is one of the pig domestication centers (Larson et al., 2005). Recent studies suggest that there are possibly multiple domestication locations in China, and it is likely that there has been genetic exchange between different breeds since initial domestication and breed formation (

Population Genetic Analysis of Six Chinese Indigenous Pig Meta-Populations Based on Geographically Isolated Regions

“…A population structure analysis provided evidence for introgression from exotic ancestry into Chinese indigenous pigs ( Figure 2 C), consistent with previous studies [ 27 ]. In addition, there were more genetic components in the SWC and CC meta-populations, which was consistent with the results of a frequent gene exchange in southern China [ 28 ]. The SC meta-population had unique genetic features compared to the others ( Figure 2 B,C), which could result from unique selective pressures from the hot and humid climate and from artificial selection for a small body size by humans [ 29 ] or long-term ancestral isolation.…”

Genetic introgression from commercial European pigs to the indigenous Chinese Lijiang breed and associated changes in phenotypes

“…The history of hybridization in indigenous Chinese pig breeds is complex, with dominant haplotypes from a given population potentially transmitted through multiple steps into another population. A two-step introgression from large-sized pigs into small-sized pigs to produce the Dahuabai breed is consistent with historical accounts [ 6 ]. The gene flow event between EP and indigenous Chinese pigs is likely more recent and widespread than the introgression into the Dahuabai breed, mainly due to improved road access to the outside world compared to that in Ancient China.…”

“…Genetic introgression yields a diverse range of distinct phenotypes in livestock. Unlike adaptive introgression, which occurs naturally and helps develop resistance and adaptation to environmental changes [ 1 – 3 ], human-mediated genetic introgression is a recent and intentional intervention related to domestication and migration of livestock [ 4 – 6 ]. Human-mediated genetic introgression enhances genetic diversity and improves the performance of economic traits.…”

Haplogroupe Mitochondrial Des Lignées Modernes De Porcs Hybrides

“…Les recherches menées (Giuffra E., Kijas J. M., Amarger V., 2000) ont montré que les données indiquaient une origine hybride de certaines grandes races porcines « européennes ». L'hybridation est répandue dans la nature et est un outil précieux dans l'élevage domestique [4]. L'introgression génétique peut entraîner la transmission d'allèles bénéfiques [4].…”

“…L'hybridation est répandue dans la nature et est un outil précieux dans l'élevage domestique [4]. L'introgression génétique peut entraîner la transmission d'allèles bénéfiques [4]. Un nombre croissant de preuves suggère un rôle substantiel de l'introgression dans l'amélioration des races domestiquées [5,6].…”