Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim

Detalhes bibliográficos
Autor(a) principal: Mello, Silvio de Paula [UNESP]
Data de Publicação: 2002
Outros Autores: Alencar, Maurício Mello de, Silva, Luiz Otávio Campos da, Barbosa, Rogério Taveira, Barbosa, Pedro Franklin
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S1516-35982002000700013
http://hdl.handle.net/11449/33616
Resumo: The objectives of this study were to estimate variances and covariances and to evaluate the genetic trends for body weight at birth (BW), weaning (WW) and twelve months of age (YW) in a Canchim (5/8 Charolais + 3/8 Zebu) herd. Data on 6.517 animals, born from 1953 through 1996, were used to estimate breeding values by the derivative free restricted maximum likelihood method, using a model that included the fixed effects of contemporary group (year-season of birth-sex of calf) and the covariable age of cow at calving (linear and quadratic effects), and the random additive direct, additive maternal and permanent environmental effects. Genetic trends for direct. maternal and total Maternal effects were estimated by the weighed regression of the annual (generation) breeding value (direct, maternal and total maternal) means on year (generation) of birth of the animals. The direct heritability estimates were equal to 0.39, 0.48 and 0.63 for BW. WW and YW. respectively, while the maternal heritabilities were, in the same order, equal to 0.03, 0.04 and 0.05, respectively. The annual direct genetic trends were equal to 0.046, 1.336 and 1.619 kg for BW, WW and YW, respectively, corresponding to 0.13, 0.66 and 0.75% of the herd means. By generation, the genetic trends were, in the same order, 0.269, 7.715 and 9.599 kg, respectively. The maternal and total maternal genetic trends were linear and positive. The results showed that the selection criteria used resulted in genetic progress for BW, WW and YW; however, the progress obtained was much smaller than the possible one.
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spelling Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho CanchimEstimativas de (co) variâncias e tendências genéticas para pesos em um rebanho CanchimEstimates of variances and covariances and genetic trends for body weights in a Canchim herdbeef cattlebody weightsgenetic trendThe objectives of this study were to estimate variances and covariances and to evaluate the genetic trends for body weight at birth (BW), weaning (WW) and twelve months of age (YW) in a Canchim (5/8 Charolais + 3/8 Zebu) herd. Data on 6.517 animals, born from 1953 through 1996, were used to estimate breeding values by the derivative free restricted maximum likelihood method, using a model that included the fixed effects of contemporary group (year-season of birth-sex of calf) and the covariable age of cow at calving (linear and quadratic effects), and the random additive direct, additive maternal and permanent environmental effects. Genetic trends for direct. maternal and total Maternal effects were estimated by the weighed regression of the annual (generation) breeding value (direct, maternal and total maternal) means on year (generation) of birth of the animals. The direct heritability estimates were equal to 0.39, 0.48 and 0.63 for BW. WW and YW. respectively, while the maternal heritabilities were, in the same order, equal to 0.03, 0.04 and 0.05, respectively. The annual direct genetic trends were equal to 0.046, 1.336 and 1.619 kg for BW, WW and YW, respectively, corresponding to 0.13, 0.66 and 0.75% of the herd means. By generation, the genetic trends were, in the same order, 0.269, 7.715 and 9.599 kg, respectively. The maternal and total maternal genetic trends were linear and positive. The results showed that the selection criteria used resulted in genetic progress for BW, WW and YW; however, the progress obtained was much smaller than the possible one.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNESP Jaboticabal, FAFRAM, Ituverava, SP, BrazilEmbrapa Pecuaria Sudeste, Sao Carlos, SP, BrazilEmbrapa Gado Corte, Campo Grande, SP, BrazilPós-graduação da UNESP, JaboticabalRevista Brasileira Zootecnia Brazilian Journal Animal SciUniversidade Estadual Paulista (Unesp)Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)Faculdade de Agronomia Dr. Francisco Maeda (FAFRAM)Mello, Silvio de Paula [UNESP]Alencar, Maurício Mello deSilva, Luiz Otávio Campos daBarbosa, Rogério TaveiraBarbosa, Pedro Franklin2014-05-20T15:22:41Z2014-05-20T15:22:41Z2002-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1707-1714application/pdfhttp://dx.doi.org/10.1590/S1516-35982002000700013Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science. Vicosa-mg: Revista Brasileira Zootecnia Brazilian Journal Animal Sci, v. 31, n. 4, p. 1707-1714, 2002.1516-3598http://hdl.handle.net/11449/3361610.1590/S1516-35982002000700013S1516-35982002000700013WOS:0001838591000132-s2.0-0344687346WOS000183859100013.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporRevista Brasileira de Zootecnia = Brazilian Journal of Animal Science0,337info:eu-repo/semantics/openAccess2023-12-26T06:16:42Zoai:repositorio.unesp.br:11449/33616Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:19:48.401191Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
Estimativas de (co) variâncias e tendências genéticas para pesos em um rebanho Canchim
Estimates of variances and covariances and genetic trends for body weights in a Canchim herd
title Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
spellingShingle Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
Mello, Silvio de Paula [UNESP]
beef cattle
body weights
genetic trend
title_short Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
title_full Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
title_fullStr Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
title_full_unstemmed Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
title_sort Estimativas de (Co)Variâncias e Tendências Genéticas para Pesos em um Rebanho Canchim
author Mello, Silvio de Paula [UNESP]
author_facet Mello, Silvio de Paula [UNESP]
Alencar, Maurício Mello de
Silva, Luiz Otávio Campos da
Barbosa, Rogério Taveira
Barbosa, Pedro Franklin
author_role author
author2 Alencar, Maurício Mello de
Silva, Luiz Otávio Campos da
Barbosa, Rogério Taveira
Barbosa, Pedro Franklin
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Faculdade de Agronomia Dr. Francisco Maeda (FAFRAM)
dc.contributor.author.fl_str_mv Mello, Silvio de Paula [UNESP]
Alencar, Maurício Mello de
Silva, Luiz Otávio Campos da
Barbosa, Rogério Taveira
Barbosa, Pedro Franklin
dc.subject.por.fl_str_mv beef cattle
body weights
genetic trend
topic beef cattle
body weights
genetic trend
description The objectives of this study were to estimate variances and covariances and to evaluate the genetic trends for body weight at birth (BW), weaning (WW) and twelve months of age (YW) in a Canchim (5/8 Charolais + 3/8 Zebu) herd. Data on 6.517 animals, born from 1953 through 1996, were used to estimate breeding values by the derivative free restricted maximum likelihood method, using a model that included the fixed effects of contemporary group (year-season of birth-sex of calf) and the covariable age of cow at calving (linear and quadratic effects), and the random additive direct, additive maternal and permanent environmental effects. Genetic trends for direct. maternal and total Maternal effects were estimated by the weighed regression of the annual (generation) breeding value (direct, maternal and total maternal) means on year (generation) of birth of the animals. The direct heritability estimates were equal to 0.39, 0.48 and 0.63 for BW. WW and YW. respectively, while the maternal heritabilities were, in the same order, equal to 0.03, 0.04 and 0.05, respectively. The annual direct genetic trends were equal to 0.046, 1.336 and 1.619 kg for BW, WW and YW, respectively, corresponding to 0.13, 0.66 and 0.75% of the herd means. By generation, the genetic trends were, in the same order, 0.269, 7.715 and 9.599 kg, respectively. The maternal and total maternal genetic trends were linear and positive. The results showed that the selection criteria used resulted in genetic progress for BW, WW and YW; however, the progress obtained was much smaller than the possible one.
publishDate 2002
dc.date.none.fl_str_mv 2002-07-01
2014-05-20T15:22:41Z
2014-05-20T15:22:41Z
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://dx.doi.org/10.1590/S1516-35982002000700013
Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science. Vicosa-mg: Revista Brasileira Zootecnia Brazilian Journal Animal Sci, v. 31, n. 4, p. 1707-1714, 2002.
1516-3598
http://hdl.handle.net/11449/33616
10.1590/S1516-35982002000700013
S1516-35982002000700013
WOS:000183859100013
2-s2.0-0344687346
WOS000183859100013.pdf
url http://dx.doi.org/10.1590/S1516-35982002000700013
http://hdl.handle.net/11449/33616
identifier_str_mv Revista Brasileira de Zootecnia-Brazilian Journal of Animal Science. Vicosa-mg: Revista Brasileira Zootecnia Brazilian Journal Animal Sci, v. 31, n. 4, p. 1707-1714, 2002.
1516-3598
10.1590/S1516-35982002000700013
S1516-35982002000700013
WOS:000183859100013
2-s2.0-0344687346
WOS000183859100013.pdf
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Revista Brasileira de Zootecnia = Brazilian Journal of Animal Science
0,337
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1707-1714
application/pdf
dc.publisher.none.fl_str_mv Revista Brasileira Zootecnia Brazilian Journal Animal Sci
publisher.none.fl_str_mv Revista Brasileira Zootecnia Brazilian Journal Animal Sci
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
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institution UNESP
reponame_str Repositório Institucional da UNESP
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repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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