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Gembloux Agro-Bio Tech (GxABT)
Gembloux Agro-Bio Tech (GxABT)
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Analyzing the genetic diversity in Walloon and European Piétrain pig populations using pseudo-phenotypes, pedigree and SNP marker data

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Wilmot, Hélène ULiège
Promotor(s) : Gengler, Nicolas ULiège ; Vanderick, Sylvie ULiège
Date of defense : 6-Sep-2019 • Permalink : http://hdl.handle.net/2268.2/8458
Details
Title : Analyzing the genetic diversity in Walloon and European Piétrain pig populations using pseudo-phenotypes, pedigree and SNP marker data
Translated title : [fr] Analyse de la diversité génétique des populations wallonne et européennes de porc Piétrain par l'utilisation des pseudo-phénotypes, du pedigree et des marqueurs SNP
Author : Wilmot, Hélène ULiège
Date of defense  : 6-Sep-2019
Advisor(s) : Gengler, Nicolas ULiège
Vanderick, Sylvie ULiège
Committee's member(s) : Beckers, Yves ULiège
Everaert, Nadia ULiège
Soyeurt, Hélène ULiège
Mayeres, Patrick 
Language : English
Number of pages : IX,85+3
Keywords : [en] Piétrain
[en] conservation
[en] pedigree
[en] phenotypes
[en] SNP
[en] genetic
[en] populations
Discipline(s) : Life sciences > Agriculture & agronomy
Target public : Researchers
Professionals of domain
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en bioingénieur : sciences agronomiques, à finalité spécialisée
Faculty: Master thesis of the Gembloux Agro-Bio Tech (GxABT)

Abstract

[en] This study aims to infer the origin of the Piétrain breed, to estimate the diversity of the Walloon Piétrain population and to analyze the existing genetic diversity of different European Piétrain populations. For these purposes, pedigree and pseudo-phenotypes (i.e. deregressed estimated breeding values) of the Walloon population and genotypes of several European populations were analyzed. The Multi-Dimensional Scaling (MDS) based on genotypes did not allow to have an exact assumption of the Piétrain breed origin. However, it suggested the involvement of different local English (e.g. Berkshire) and Spotted breeds. To have an insight of the Walloon genetic diversity, different pedigree parameters of boars provided to progeny testing were then analyzed. The average inbreeding coefficient was 2.74%, the effective population size (Ne) was 223 and the genetic diversity parameter was 97.96%. The genetic diversity found in the Walloon population seemed therefore relatively high. Gene flows, relatively uncommon between farms, were also studied by a MDS based on the opposite of kinship coefficients. A Principal Component Analysis (PCA) based on pseudo-phenotypes provided complementary information about breeding objectives as it was found that owners focused on meat or growth traits. It could therefore be suggested to the Belgian Piétrain program, based on the boar’s semen cryopreservation, to sample representative boars in the population regarding its genetic and phenotypic diversities. Moreover, as one owner provided 55% of the tested boars, owners should equally contribute to progeny testing. Finally, different European and an American Piétrain populations were analyzed through genotypes. Inbreeding estimations and Runs of Homozygosity (ROHs) stated that Dutch and American populations, supposedly held by commercial firms, were more inbred and uniform. More exchanges of animals should be done in these populations to avoid bottleneck in the future.


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Author

  • Wilmot, Hélène ULiège Université de Liège > Gembloux Agro-Bio Tech

Promotor(s)

Committee's member(s)

  • Beckers, Yves ULiège Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition
    ORBi View his publications on ORBi
  • Everaert, Nadia ULiège Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition
    ORBi View his publications on ORBi
  • Soyeurt, Hélène ULiège Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Modélisation et développement
    ORBi View his publications on ORBi
  • Mayeres, Patrick Awé asbl-Ciney
  • Total number of views 41
  • Total number of downloads 131










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