Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.15/3446 |
Resumo: | The aims of this study were to evaluate the genetic diversity of the racing line Quarter Horse breed in Brazil and to provide data on the most influential ancestors by pedigree analysis. All horses that had participated in sprint races in Brazil between 1978 and 2016 were evaluated. There were 5,861 athletes horses (2,474 males and 3,387 females) born between 1971 and 2014. These animals were referred to as the racing population (Pr), which was divided into three subpopulations to evaluate three complete decades (84.5% of Pr). These subpopulations consisted of 1,712, 1,604 and 1,461 animals born in the 1980s (sP80), 1990s (sP90) and 2000s (sP00), respectively. The quality of the pedigree was assessed based on the number of complete equivalent generation traced. There were 5.4 (Pr), 4.7 (sP80), 5.7 (sP90) and 6.3 (sP00) generations, which permitted accuracy of the conclusions reported. The generation intervals were long, with 13.2 (sire-son/daughter) and 10.6 (dams-son/daughter) years (Pr). The coefficients of inbreeding and average relatedness were 0.95% and 1.84% for Pr and 1.60% and 2.56% for sP00, respectively. In Pr and sP00, the effective population size (Ne) based on ΔFi was 215 and 144, respectively, with 68 and 41 animals per generation. The probability of gene origin given by the effective number of founders (fe), ancestors (fa) and founder genome equivalents (fge) was 192, 61 and 34, respectively, for Pr, with considerable losses of genetic diversity over the last decades evaluated. The number of ancestors (founders or not) that explained the total genetic diversity was 1,587. This number is considered high; however, only 32 and 9 ancestors explained 50% of the genetic diversity of Pr and sP00, respectively. The 10 most influential ancestors of sP00 explained 52.2% of the total genetic diversity. The loss of genetic diversity and concentration in a reduced number of breeding animals indicate failures in the breeding and conservation programs of the racing line. Mating designs in conjunction with the selection of breeding animals should be promoted and goals should be defined for racing line of the Quarter Horse breed in Brazil. |
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Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestorsEffective population sizeGeneration intervalInbreedingPedigree chartCavalo Quarto de MilhaMelhoramento animalThe aims of this study were to evaluate the genetic diversity of the racing line Quarter Horse breed in Brazil and to provide data on the most influential ancestors by pedigree analysis. All horses that had participated in sprint races in Brazil between 1978 and 2016 were evaluated. There were 5,861 athletes horses (2,474 males and 3,387 females) born between 1971 and 2014. These animals were referred to as the racing population (Pr), which was divided into three subpopulations to evaluate three complete decades (84.5% of Pr). These subpopulations consisted of 1,712, 1,604 and 1,461 animals born in the 1980s (sP80), 1990s (sP90) and 2000s (sP00), respectively. The quality of the pedigree was assessed based on the number of complete equivalent generation traced. There were 5.4 (Pr), 4.7 (sP80), 5.7 (sP90) and 6.3 (sP00) generations, which permitted accuracy of the conclusions reported. The generation intervals were long, with 13.2 (sire-son/daughter) and 10.6 (dams-son/daughter) years (Pr). The coefficients of inbreeding and average relatedness were 0.95% and 1.84% for Pr and 1.60% and 2.56% for sP00, respectively. In Pr and sP00, the effective population size (Ne) based on ΔFi was 215 and 144, respectively, with 68 and 41 animals per generation. The probability of gene origin given by the effective number of founders (fe), ancestors (fa) and founder genome equivalents (fge) was 192, 61 and 34, respectively, for Pr, with considerable losses of genetic diversity over the last decades evaluated. The number of ancestors (founders or not) that explained the total genetic diversity was 1,587. This number is considered high; however, only 32 and 9 ancestors explained 50% of the genetic diversity of Pr and sP00, respectively. The 10 most influential ancestors of sP00 explained 52.2% of the total genetic diversity. The loss of genetic diversity and concentration in a reduced number of breeding animals indicate failures in the breeding and conservation programs of the racing line. Mating designs in conjunction with the selection of breeding animals should be promoted and goals should be defined for racing line of the Quarter Horse breed in Brazil.ElsevierRepositório Científico do Instituto Politécnico de SantarémFaria, R.A.S.Vicente, AntónioOspina, A.M.T.Silva, J.A.V.2021-04-06T15:42:21Z20212021-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.15/3446engFaria, R.A.; Vicente, A.P.A.; Ospina, A.M.T; Silva, J.A.V. (2021). Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors. Livestok science, 247, https://doi.org/10.1016/j.livsci.2021.1044841044841871-1413https://doi.org/10.1016/j.livsci.2021.104484info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-21T07:35:14Zoai:repositorio.ipsantarem.pt:10400.15/3446Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:55:13.582147Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
title |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
spellingShingle |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors Faria, R.A.S. Effective population size Generation interval Inbreeding Pedigree chart Cavalo Quarto de Milha Melhoramento animal |
title_short |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
title_full |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
title_fullStr |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
title_full_unstemmed |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
title_sort |
Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors |
author |
Faria, R.A.S. |
author_facet |
Faria, R.A.S. Vicente, António Ospina, A.M.T. Silva, J.A.V. |
author_role |
author |
author2 |
Vicente, António Ospina, A.M.T. Silva, J.A.V. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Repositório Científico do Instituto Politécnico de Santarém |
dc.contributor.author.fl_str_mv |
Faria, R.A.S. Vicente, António Ospina, A.M.T. Silva, J.A.V. |
dc.subject.por.fl_str_mv |
Effective population size Generation interval Inbreeding Pedigree chart Cavalo Quarto de Milha Melhoramento animal |
topic |
Effective population size Generation interval Inbreeding Pedigree chart Cavalo Quarto de Milha Melhoramento animal |
description |
The aims of this study were to evaluate the genetic diversity of the racing line Quarter Horse breed in Brazil and to provide data on the most influential ancestors by pedigree analysis. All horses that had participated in sprint races in Brazil between 1978 and 2016 were evaluated. There were 5,861 athletes horses (2,474 males and 3,387 females) born between 1971 and 2014. These animals were referred to as the racing population (Pr), which was divided into three subpopulations to evaluate three complete decades (84.5% of Pr). These subpopulations consisted of 1,712, 1,604 and 1,461 animals born in the 1980s (sP80), 1990s (sP90) and 2000s (sP00), respectively. The quality of the pedigree was assessed based on the number of complete equivalent generation traced. There were 5.4 (Pr), 4.7 (sP80), 5.7 (sP90) and 6.3 (sP00) generations, which permitted accuracy of the conclusions reported. The generation intervals were long, with 13.2 (sire-son/daughter) and 10.6 (dams-son/daughter) years (Pr). The coefficients of inbreeding and average relatedness were 0.95% and 1.84% for Pr and 1.60% and 2.56% for sP00, respectively. In Pr and sP00, the effective population size (Ne) based on ΔFi was 215 and 144, respectively, with 68 and 41 animals per generation. The probability of gene origin given by the effective number of founders (fe), ancestors (fa) and founder genome equivalents (fge) was 192, 61 and 34, respectively, for Pr, with considerable losses of genetic diversity over the last decades evaluated. The number of ancestors (founders or not) that explained the total genetic diversity was 1,587. This number is considered high; however, only 32 and 9 ancestors explained 50% of the genetic diversity of Pr and sP00, respectively. The 10 most influential ancestors of sP00 explained 52.2% of the total genetic diversity. The loss of genetic diversity and concentration in a reduced number of breeding animals indicate failures in the breeding and conservation programs of the racing line. Mating designs in conjunction with the selection of breeding animals should be promoted and goals should be defined for racing line of the Quarter Horse breed in Brazil. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-04-06T15:42:21Z 2021 2021-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.15/3446 |
url |
http://hdl.handle.net/10400.15/3446 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Faria, R.A.; Vicente, A.P.A.; Ospina, A.M.T; Silva, J.A.V. (2021). Pedigree analysis of the racing line Quarter Horse: genetic diversity and most influential ancestors. Livestok science, 247, https://doi.org/10.1016/j.livsci.2021.104484104484 1871-1413 https://doi.org/10.1016/j.livsci.2021.104484 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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