Confiabilidade do valor genético predito em diferentes populações
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional Manancial UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/14078 |
Resumo: | The purpose of this study was to evaluate the effect of reducing the number of lactation controls on the accuracy of the prediction of the genetic value of the animals. The database provided by the Brazilian Association of Breeders of the Dutch Breed was edited to contain only performance observations collected from cows with 10 monthly controls in lactation and was composed of 111,840 records of monthly production collected between 1991 and 2010 and from this, by random elimination of 1, 2, 3, 4, 5 and 6 controls, six other files were generated, totaling seven different populations, bringing together cows with 10, 9, 8, 7, 6, 5 and 4 controls in lactation, respectively. Genetic parameters and values were estimated by means of a random regression model with a polynomial of order 4 for genetic and permanent environment effects and homogeneous residual variances. Breeders were grouped according to the number of daughters to verify differences in mean reliability of predicted genetic values and Spearman rank correlation between genetic values of the best 10 and 20% breeding herds was calculated in the different populations to determine if there were changes in the ranking. Populations with number of partial controls had lower genetic variance, and consequently lower heritability for milk production; the mean reliability was lower in populations with lower number of controls; the number of bulls with high reliability was also lower; the Spearman correlations presented mean values, indicating that there are changes in the ranking of the best animals. Therefore, the reduction in the number of lactation controls negatively affects the genetic evaluation of populations. |
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2018-08-22T20:32:18Z2018-08-22T20:32:18Z2018-02-26http://repositorio.ufsm.br/handle/1/14078The purpose of this study was to evaluate the effect of reducing the number of lactation controls on the accuracy of the prediction of the genetic value of the animals. The database provided by the Brazilian Association of Breeders of the Dutch Breed was edited to contain only performance observations collected from cows with 10 monthly controls in lactation and was composed of 111,840 records of monthly production collected between 1991 and 2010 and from this, by random elimination of 1, 2, 3, 4, 5 and 6 controls, six other files were generated, totaling seven different populations, bringing together cows with 10, 9, 8, 7, 6, 5 and 4 controls in lactation, respectively. Genetic parameters and values were estimated by means of a random regression model with a polynomial of order 4 for genetic and permanent environment effects and homogeneous residual variances. Breeders were grouped according to the number of daughters to verify differences in mean reliability of predicted genetic values and Spearman rank correlation between genetic values of the best 10 and 20% breeding herds was calculated in the different populations to determine if there were changes in the ranking. Populations with number of partial controls had lower genetic variance, and consequently lower heritability for milk production; the mean reliability was lower in populations with lower number of controls; the number of bulls with high reliability was also lower; the Spearman correlations presented mean values, indicating that there are changes in the ranking of the best animals. Therefore, the reduction in the number of lactation controls negatively affects the genetic evaluation of populations.O propósito deste trabalho foi avaliar o efeito da redução do número de controles por lactação sobre a precisão da predição do valor genético dos animais. O banco de dados, cedido pela Associação Brasileira de Criadores de Bovinos da Raça Holandesa, foi editado para conter somente observações de desempenho coletadas de vacas com 10 controles mensais na lactação e ficou composto por 111.840 registros de produções mensais coletadas entre os anos de 1991 a 2010 e, a partir deste, pela eliminação aleatória de 1, 2, 3, 4, 5 e 6 controles, foram gerados outros seis arquivos, totalizando sete diferentes populações, reunindo vacas com 10, 9, 8, 7, 6, 5 e 4 controles na lactação, respectivamente. Os parâmetros e valores genéticos foram estimados por meio de um modelo de regressão aleatória com polinômio de ordem quatro para efeito genético e de ambiente permanente e variâncias residuais homogêneas. Os reprodutores foram agrupados de acordo com o número de filhas, para verificar diferenças na confiabilidade média dos valores genéticos preditos e a correlação de ranking de Spearman entre os valores genéticos dos 10 e 20% melhores reprodutores foi calculada nas diferentes populações para averiguar se ocorre alterações no ranqueamento. As populações com número de controles parciais apresentaram menor variância genética, e consequentemente isso menor herdabilidade para a produção de leite; a confiabilidade média foi menor nas populações com menor número de controles; o número de touros com alta confiabilidade também foi menor; as correlações de Spearman apresentaram valores médios, indicando que existe alterações no ranqueamento dos melhores animais. Portanto, a redução do número de controles por lactação afeta negativamente a avaliação genética das populações.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESporUniversidade Federal de Santa MariaCentro de Ciências RuraisPrograma de Pós-Graduação em ZootecniaUFSMBrasilZootecniaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessConfiabilidadeCorrelação de SpearmanHerdabilidadeRegressão aleatóriaHeritabilityReliabilityRandom regression modelsSpearman correlationCNPQ::CIENCIAS AGRARIAS::ZOOTECNIAConfiabilidade do valor genético predito em diferentes populaçõesReliability of predicted breeding value in different populationsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisMello, Fernanda Cristina Bredahttp://lattes.cnpq.br/9702654931601290Prestes, Alan Mirandahttp://lattes.cnpq.br/5914334583507434Dornelles, Mariana de Almeidahttp://lattes.cnpq.br/4198666573592568http://lattes.cnpq.br/7689972315832587Feltes, Giovani Luis5004000000026008a1be6e4-8da1-49f0-833c-c6485b370c2466091c24-3607-4d3f-89b0-8cc6dc9c39e3c26a6629-5349-45f8-a8c6-496184109d1f9b9d726f-2a28-424b-926d-55ae6e7386cdreponame:Repositório Institucional Manancial UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMLICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Confiabilidade do valor genético predito em diferentes populações |
dc.title.alternative.eng.fl_str_mv |
Reliability of predicted breeding value in different populations |
title |
Confiabilidade do valor genético predito em diferentes populações |
spellingShingle |
Confiabilidade do valor genético predito em diferentes populações Feltes, Giovani Luis Confiabilidade Correlação de Spearman Herdabilidade Regressão aleatória Heritability Reliability Random regression models Spearman correlation CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
title_short |
Confiabilidade do valor genético predito em diferentes populações |
title_full |
Confiabilidade do valor genético predito em diferentes populações |
title_fullStr |
Confiabilidade do valor genético predito em diferentes populações |
title_full_unstemmed |
Confiabilidade do valor genético predito em diferentes populações |
title_sort |
Confiabilidade do valor genético predito em diferentes populações |
author |
Feltes, Giovani Luis |
author_facet |
Feltes, Giovani Luis |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Mello, Fernanda Cristina Breda |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9702654931601290 |
dc.contributor.referee1.fl_str_mv |
Prestes, Alan Miranda |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/5914334583507434 |
dc.contributor.referee2.fl_str_mv |
Dornelles, Mariana de Almeida |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/4198666573592568 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/7689972315832587 |
dc.contributor.author.fl_str_mv |
Feltes, Giovani Luis |
contributor_str_mv |
Mello, Fernanda Cristina Breda Prestes, Alan Miranda Dornelles, Mariana de Almeida |
dc.subject.por.fl_str_mv |
Confiabilidade Correlação de Spearman Herdabilidade Regressão aleatória |
topic |
Confiabilidade Correlação de Spearman Herdabilidade Regressão aleatória Heritability Reliability Random regression models Spearman correlation CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
dc.subject.eng.fl_str_mv |
Heritability Reliability Random regression models Spearman correlation |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA |
description |
The purpose of this study was to evaluate the effect of reducing the number of lactation controls on the accuracy of the prediction of the genetic value of the animals. The database provided by the Brazilian Association of Breeders of the Dutch Breed was edited to contain only performance observations collected from cows with 10 monthly controls in lactation and was composed of 111,840 records of monthly production collected between 1991 and 2010 and from this, by random elimination of 1, 2, 3, 4, 5 and 6 controls, six other files were generated, totaling seven different populations, bringing together cows with 10, 9, 8, 7, 6, 5 and 4 controls in lactation, respectively. Genetic parameters and values were estimated by means of a random regression model with a polynomial of order 4 for genetic and permanent environment effects and homogeneous residual variances. Breeders were grouped according to the number of daughters to verify differences in mean reliability of predicted genetic values and Spearman rank correlation between genetic values of the best 10 and 20% breeding herds was calculated in the different populations to determine if there were changes in the ranking. Populations with number of partial controls had lower genetic variance, and consequently lower heritability for milk production; the mean reliability was lower in populations with lower number of controls; the number of bulls with high reliability was also lower; the Spearman correlations presented mean values, indicating that there are changes in the ranking of the best animals. Therefore, the reduction in the number of lactation controls negatively affects the genetic evaluation of populations. |
publishDate |
2018 |
dc.date.accessioned.fl_str_mv |
2018-08-22T20:32:18Z |
dc.date.available.fl_str_mv |
2018-08-22T20:32:18Z |
dc.date.issued.fl_str_mv |
2018-02-26 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/14078 |
url |
http://repositorio.ufsm.br/handle/1/14078 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.cnpq.fl_str_mv |
500400000002 |
dc.relation.confidence.fl_str_mv |
600 |
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dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Rurais |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Zootecnia |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Zootecnia |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Ciências Rurais |
dc.source.none.fl_str_mv |
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