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Gembloux Agro-Bio Tech (GxABT)
Gembloux Agro-Bio Tech (GxABT)
MASTER THESIS
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East-Belgian Red and White (EBRW): Assessing genetic and phenotypic diversity and developing practical recommendations for the management of genetic diversity at mating

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Demonty, Thomas ULiège
Promotor(s) : Gengler, Nicolas ULiège ; Sölkner, Johann
Date of defense : 26-Aug-2021 • Permalink : http://hdl.handle.net/2268.2/13251
Details
Title : East-Belgian Red and White (EBRW): Assessing genetic and phenotypic diversity and developing practical recommendations for the management of genetic diversity at mating
Author : Demonty, Thomas ULiège
Date of defense  : 26-Aug-2021
Advisor(s) : Gengler, Nicolas ULiège
Sölkner, Johann 
Committee's member(s) : Lassois, Ludivine ULiège
Bindelle, Jérôme ULiège
Schroyen, Martine ULiège
Soyeurt, Hélène ULiège
Vanderick, Sylvie ULiège
Wilmot, Hélène ULiège
Mayeres, Patrick 
Language : English
Number of pages : 81
Discipline(s) : Life sciences > Animal production & animal husbandry
Life sciences > Genetics & genetic processes
Target public : Researchers
Professionals of domain
Student
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] The objective of this study is to assess the genetic and phenotypic diversity of the East-Belgian Red & White (EBRW) cattle breed. First, pedigree and genomic data were used to have an insight of population structure and to the within-breed genetic diversity by estimating heterozygosity and inbreeding and relationship coefficients. Then, records from milk recording were used in parallel with pseudo-phenotypes, i.e. deregressed estimated breeding values, to display the (pseudo-)phenotypic diversity existing between animals and herds reflecting differences in breeding objectives. This was achieved through principal component analysis. Based on the limited pedigree information, 2% of the EBRW population studied appear to be inbred with an average pedigree inbreeding of 2.3%. The pedigree information also confirmed to use of introgression in the past decades. Turning to genomic data, the observed heterozygosity was 0.358 and more than 40% of the genotyped population was inbred with average inbreeding estimates ranging from 2.9 to 3.5%. Phenotypical variation mostly occurs in regards to the milk yield what might reflect different breeding objectives. This tendency was also confirmed in pseudo-phenotypes. To conclude, practical recommendations were also formulated to manage the EBRW genetic diversity through mating with a focus on the 13 EBRW bulls available for artificial insemination. Finally, the EBRW genetic diversity seems to be relatively high while presenting limited inbreeding level and the phenotypic diversity seems to reflect divergent breeding objectives.


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Author

  • Demonty, Thomas ULiège Université de Liège > Gembloux Agro-Bio Tech

Promotor(s)

Committee's member(s)

  • Lassois, Ludivine ULiège Université de Liège - ULiège > Département GxABT > Gestion des ressources forestières et des milieux naturels
    ORBi View his publications on ORBi
  • Bindelle, Jérôme ULiège Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
    ORBi View his publications on ORBi
  • Schroyen, Martine ULiège Université de Liège - ULiège > Département GxABT > Département GxABT
    ORBi View his publications on ORBi
  • Soyeurt, Hélène ULiège Université de Liège - ULiège > Département GxABT > Modélisation et développement
    ORBi View his publications on ORBi
  • Vanderick, Sylvie ULiège Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
    ORBi View his publications on ORBi
  • Wilmot, Hélène ULiège Université de Liège - ULiège > Département GxABT > Ingénierie des productions animales et nutrition
    ORBi View his publications on ORBi
  • Mayeres, Patrick Awé asbl-Ciney
  • Total number of views 24
  • Total number of downloads 51










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