Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://hdl.handle.net/11449/224405 |
Resumo: | The objective of this study was to investigate, via simulated data, the effect of heterogeneity of residual variance among contemporary groups (CG) on genetic evaluation of beef cattle, and to compare a weighted genetic evaluation procedure (R≠Iσe2) with one that assumes homogeneity of variances (R = Iσe2). Different data sets of postweaning weight gain, adjusted to 345 days, were simulated with and without heterogeneity of residual variance, using a phenotypic variance of 300 kg2 and a true heritability of 0.4. A real data set was used to provide the CG and parents related to each animal observation. Results showed that, when high levels of heterogeneity of residual variance were considered, animals were selected from CG with higher variability, especially with intense selection. With respect to prediction consistency, non parent animals and cows had their predicted breeding values more affected by heterogeneity of residual variance than sires. The weighed factor used reduced, but did not eliminate, the effect of heterogeneity of residual variance. The results of weighted genetic evaluations were similar or superior to those from evaluations that assumed homogeneity of variances. Even when the variances were homogeneous, the weighed genetic evaluations yielded results that were not inferior than those from the usual evaluations, which assumed homogeneity of variances. |
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Repositório Institucional da UNESP |
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Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corteEffects of heterogeneity of residual variance among contemporary groups on genetic evaluation of beef cattleAccuracyConsistencySimulationWeighed estimateThe objective of this study was to investigate, via simulated data, the effect of heterogeneity of residual variance among contemporary groups (CG) on genetic evaluation of beef cattle, and to compare a weighted genetic evaluation procedure (R≠Iσe2) with one that assumes homogeneity of variances (R = Iσe2). Different data sets of postweaning weight gain, adjusted to 345 days, were simulated with and without heterogeneity of residual variance, using a phenotypic variance of 300 kg2 and a true heritability of 0.4. A real data set was used to provide the CG and parents related to each animal observation. Results showed that, when high levels of heterogeneity of residual variance were considered, animals were selected from CG with higher variability, especially with intense selection. With respect to prediction consistency, non parent animals and cows had their predicted breeding values more affected by heterogeneity of residual variance than sires. The weighed factor used reduced, but did not eliminate, the effect of heterogeneity of residual variance. The results of weighted genetic evaluations were similar or superior to those from evaluations that assumed homogeneity of variances. Even when the variances were homogeneous, the weighed genetic evaluations yielded results that were not inferior than those from the usual evaluations, which assumed homogeneity of variances.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Zootecnia DZ-FCAV-UNESP Bolsista FAPESP, Jaboticabal, SPUniversity of Guelph, Guelph, Ont.DZ-FCAV-UNESP Bolsista CNPq, Jaboticabal, SPZootecnia DZ-FCAV-UNESP Bolsista FAPESP, Jaboticabal, SPDZ-FCAV-UNESP Bolsista CNPq, Jaboticabal, SPUniversidade Estadual Paulista (UNESP)University of GuelphCarvalheiro, Roberto [UNESP]Fries, Luiz AlbertoSchenkel, Flávio SchrammDe Albuquerque, Lucia Galvão [UNESP]2022-04-28T19:56:25Z2022-04-28T19:56:25Z2002-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1680-1688Revista Brasileira de Zootecnia, v. 31, n. 4, p. 1680-1688, 2002.0100-4859http://hdl.handle.net/11449/2244052-s2.0-0345549492Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporRevista Brasileira de Zootecniainfo:eu-repo/semantics/openAccess2022-04-28T19:56:25Zoai:repositorio.unesp.br:11449/224405Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:56:25Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte Effects of heterogeneity of residual variance among contemporary groups on genetic evaluation of beef cattle |
title |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
spellingShingle |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte Carvalheiro, Roberto [UNESP] Accuracy Consistency Simulation Weighed estimate |
title_short |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
title_full |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
title_fullStr |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
title_full_unstemmed |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
title_sort |
Efeitos da heterogeneidade de variância residual entre grupos de contemporâneos na avaliação genética de bovinos de corte |
author |
Carvalheiro, Roberto [UNESP] |
author_facet |
Carvalheiro, Roberto [UNESP] Fries, Luiz Alberto Schenkel, Flávio Schramm De Albuquerque, Lucia Galvão [UNESP] |
author_role |
author |
author2 |
Fries, Luiz Alberto Schenkel, Flávio Schramm De Albuquerque, Lucia Galvão [UNESP] |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (UNESP) University of Guelph |
dc.contributor.author.fl_str_mv |
Carvalheiro, Roberto [UNESP] Fries, Luiz Alberto Schenkel, Flávio Schramm De Albuquerque, Lucia Galvão [UNESP] |
dc.subject.por.fl_str_mv |
Accuracy Consistency Simulation Weighed estimate |
topic |
Accuracy Consistency Simulation Weighed estimate |
description |
The objective of this study was to investigate, via simulated data, the effect of heterogeneity of residual variance among contemporary groups (CG) on genetic evaluation of beef cattle, and to compare a weighted genetic evaluation procedure (R≠Iσe2) with one that assumes homogeneity of variances (R = Iσe2). Different data sets of postweaning weight gain, adjusted to 345 days, were simulated with and without heterogeneity of residual variance, using a phenotypic variance of 300 kg2 and a true heritability of 0.4. A real data set was used to provide the CG and parents related to each animal observation. Results showed that, when high levels of heterogeneity of residual variance were considered, animals were selected from CG with higher variability, especially with intense selection. With respect to prediction consistency, non parent animals and cows had their predicted breeding values more affected by heterogeneity of residual variance than sires. The weighed factor used reduced, but did not eliminate, the effect of heterogeneity of residual variance. The results of weighted genetic evaluations were similar or superior to those from evaluations that assumed homogeneity of variances. Even when the variances were homogeneous, the weighed genetic evaluations yielded results that were not inferior than those from the usual evaluations, which assumed homogeneity of variances. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-07-01 2022-04-28T19:56:25Z 2022-04-28T19:56:25Z |
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 |
Revista Brasileira de Zootecnia, v. 31, n. 4, p. 1680-1688, 2002. 0100-4859 http://hdl.handle.net/11449/224405 2-s2.0-0345549492 |
identifier_str_mv |
Revista Brasileira de Zootecnia, v. 31, n. 4, p. 1680-1688, 2002. 0100-4859 2-s2.0-0345549492 |
url |
http://hdl.handle.net/11449/224405 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Revista Brasileira de Zootecnia |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
1680-1688 |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1799965207186898944 |