Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds

Detalhes bibliográficos
Autor(a) principal: Albuquerque,Maria do Socorro Maués
Data de Publicação: 1999
Outros Autores: Freitas,Maria Armênia Ramalho de, Teodoro,Roberto Luiz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Genetics and Molecular Biology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000200007
Resumo: Records of Gyr cows selected for milk production were obtained from the National Gyr Dairy Cattle Breeding Program (Embrapa/CNPGL) and analyzed, in order to estimate genetic parameters for the first three lactations and to verify the effects of some environmental factors on milk production from 1979 to 1994. Genetic parameters were estimated by REML with an animal model and a group of fixed effects that included classes of herd, year, season and age at calving. Milk production means and standard deviations were 2,183 kg, 707 kg; 2,682 kg, 762 kg and 2,638 kg, 851 kg, for first, second, and third lactations, respectively. Heritability estimates were 0.20, 0.12, and 0.19 for first, second, and third lactations, respectively, and repeatability was 0.44. Genetic correlation estimates were: 0.68 between first and second lactations, 0.84 between first and third lactations and 1.0 between second and third lactations. Results confirm other research for specialized dairy breeds and firmly suggest that even in breeds of Indian origin the best time to make selection decisions is during the first lactation.
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spelling Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herdsRecords of Gyr cows selected for milk production were obtained from the National Gyr Dairy Cattle Breeding Program (Embrapa/CNPGL) and analyzed, in order to estimate genetic parameters for the first three lactations and to verify the effects of some environmental factors on milk production from 1979 to 1994. Genetic parameters were estimated by REML with an animal model and a group of fixed effects that included classes of herd, year, season and age at calving. Milk production means and standard deviations were 2,183 kg, 707 kg; 2,682 kg, 762 kg and 2,638 kg, 851 kg, for first, second, and third lactations, respectively. Heritability estimates were 0.20, 0.12, and 0.19 for first, second, and third lactations, respectively, and repeatability was 0.44. Genetic correlation estimates were: 0.68 between first and second lactations, 0.84 between first and third lactations and 1.0 between second and third lactations. Results confirm other research for specialized dairy breeds and firmly suggest that even in breeds of Indian origin the best time to make selection decisions is during the first lactation.Sociedade Brasileira de Genética1999-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000200007Genetics and Molecular Biology v.22 n.2 1999reponame:Genetics and Molecular Biologyinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/S1415-47571999000200007info:eu-repo/semantics/openAccessAlbuquerque,Maria do Socorro MauésFreitas,Maria Armênia Ramalho deTeodoro,Roberto Luizeng1999-08-26T00:00:00Zoai:scielo:S1415-47571999000200007Revistahttp://www.gmb.org.br/ONGhttps://old.scielo.br/oai/scielo-oai.php||editor@gmb.org.br1678-46851415-4757opendoar:1999-08-26T00:00Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)false
dc.title.none.fl_str_mv Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
title Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
spellingShingle Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
Albuquerque,Maria do Socorro Maués
title_short Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
title_full Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
title_fullStr Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
title_full_unstemmed Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
title_sort Genetic and phenotypic parameters of productivity traits on the first three lactations in Gyr cattle herds
author Albuquerque,Maria do Socorro Maués
author_facet Albuquerque,Maria do Socorro Maués
Freitas,Maria Armênia Ramalho de
Teodoro,Roberto Luiz
author_role author
author2 Freitas,Maria Armênia Ramalho de
Teodoro,Roberto Luiz
author2_role author
author
dc.contributor.author.fl_str_mv Albuquerque,Maria do Socorro Maués
Freitas,Maria Armênia Ramalho de
Teodoro,Roberto Luiz
description Records of Gyr cows selected for milk production were obtained from the National Gyr Dairy Cattle Breeding Program (Embrapa/CNPGL) and analyzed, in order to estimate genetic parameters for the first three lactations and to verify the effects of some environmental factors on milk production from 1979 to 1994. Genetic parameters were estimated by REML with an animal model and a group of fixed effects that included classes of herd, year, season and age at calving. Milk production means and standard deviations were 2,183 kg, 707 kg; 2,682 kg, 762 kg and 2,638 kg, 851 kg, for first, second, and third lactations, respectively. Heritability estimates were 0.20, 0.12, and 0.19 for first, second, and third lactations, respectively, and repeatability was 0.44. Genetic correlation estimates were: 0.68 between first and second lactations, 0.84 between first and third lactations and 1.0 between second and third lactations. Results confirm other research for specialized dairy breeds and firmly suggest that even in breeds of Indian origin the best time to make selection decisions is during the first lactation.
publishDate 1999
dc.date.none.fl_str_mv 1999-06-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000200007
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000200007
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1415-47571999000200007
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Genética
publisher.none.fl_str_mv Sociedade Brasileira de Genética
dc.source.none.fl_str_mv Genetics and Molecular Biology v.22 n.2 1999
reponame:Genetics and Molecular Biology
instname:Sociedade Brasileira de Genética (SBG)
instacron:SBG
instname_str Sociedade Brasileira de Genética (SBG)
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reponame_str Genetics and Molecular Biology
collection Genetics and Molecular Biology
repository.name.fl_str_mv Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)
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