Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Arquivo brasileiro de medicina veterinária e zootecnia (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352021000400938 |
Resumo: | ABSTRACT The objective of this study was to estimate genetic parameters and genetic trends of different conformation and management traits regularly measured within the context of the National Dairy Gir Breeding Program (PNMGL). The estimation of genetic and residual variances for each trait was performed using average information restricted maximum likelihood (AI-REML) procedure in AIREMLF90 program software. The population was divided into three subpopulations constituted by measured females (with phenotype records), all females, and males. Linear regressions were applied for each trait, considering two periods of birth (1st period: 1938-1996; 2nd period: 1997-2012). The estimated heritability of conformation and management traits varied from 0.01 to 0.53, denoting a perspective of genetic improvement through selection and corrective matings for purebred Dairy Gir populations. The average genetic changes in conformation and management traits were, in general, variable and inexpressive, showing that the selection of Dairy Gir may have had been directed essentially to increase milk yield. The analysis of the two periods of birth indicated that some linear traits present progress (although inexpressive) in the 2nd period (more recent period). |
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Arquivo brasileiro de medicina veterinária e zootecnia (Online) |
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Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattleZebuBos taurus indicusgenetic improvementgenetic progressprogeny testABSTRACT The objective of this study was to estimate genetic parameters and genetic trends of different conformation and management traits regularly measured within the context of the National Dairy Gir Breeding Program (PNMGL). The estimation of genetic and residual variances for each trait was performed using average information restricted maximum likelihood (AI-REML) procedure in AIREMLF90 program software. The population was divided into three subpopulations constituted by measured females (with phenotype records), all females, and males. Linear regressions were applied for each trait, considering two periods of birth (1st period: 1938-1996; 2nd period: 1997-2012). The estimated heritability of conformation and management traits varied from 0.01 to 0.53, denoting a perspective of genetic improvement through selection and corrective matings for purebred Dairy Gir populations. The average genetic changes in conformation and management traits were, in general, variable and inexpressive, showing that the selection of Dairy Gir may have had been directed essentially to increase milk yield. The analysis of the two periods of birth indicated that some linear traits present progress (although inexpressive) in the 2nd period (more recent period).Universidade Federal de Minas Gerais, Escola de Veterinária2021-08-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352021000400938Arquivo Brasileiro de Medicina Veterinária e Zootecnia v.73 n.4 2021reponame:Arquivo brasileiro de medicina veterinária e zootecnia (Online)instname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMG10.1590/1678-4162-12341info:eu-repo/semantics/openAccessCarvalho,N.S.Daltro,D.S.Machado,J.D.Camargo,E.V.Panetto,J.C.C.Cobuci,J.A.eng2021-08-20T00:00:00Zoai:scielo:S0102-09352021000400938Revistahttps://www.scielo.br/j/abmvz/PUBhttps://old.scielo.br/oai/scielo-oai.phpjournal@vet.ufmg.br||abmvz.artigo@abmvz.org.br1678-41620102-0935opendoar:2021-08-20T00:00Arquivo brasileiro de medicina veterinária e zootecnia (Online) - Universidade Federal de Minas Gerais (UFMG)false |
dc.title.none.fl_str_mv |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
title |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
spellingShingle |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle Carvalho,N.S. Zebu Bos taurus indicus genetic improvement genetic progress progeny test |
title_short |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
title_full |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
title_fullStr |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
title_full_unstemmed |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
title_sort |
Genetic parameters and genetic trends of conformation and management traits in Dairy Gir cattle |
author |
Carvalho,N.S. |
author_facet |
Carvalho,N.S. Daltro,D.S. Machado,J.D. Camargo,E.V. Panetto,J.C.C. Cobuci,J.A. |
author_role |
author |
author2 |
Daltro,D.S. Machado,J.D. Camargo,E.V. Panetto,J.C.C. Cobuci,J.A. |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Carvalho,N.S. Daltro,D.S. Machado,J.D. Camargo,E.V. Panetto,J.C.C. Cobuci,J.A. |
dc.subject.por.fl_str_mv |
Zebu Bos taurus indicus genetic improvement genetic progress progeny test |
topic |
Zebu Bos taurus indicus genetic improvement genetic progress progeny test |
description |
ABSTRACT The objective of this study was to estimate genetic parameters and genetic trends of different conformation and management traits regularly measured within the context of the National Dairy Gir Breeding Program (PNMGL). The estimation of genetic and residual variances for each trait was performed using average information restricted maximum likelihood (AI-REML) procedure in AIREMLF90 program software. The population was divided into three subpopulations constituted by measured females (with phenotype records), all females, and males. Linear regressions were applied for each trait, considering two periods of birth (1st period: 1938-1996; 2nd period: 1997-2012). The estimated heritability of conformation and management traits varied from 0.01 to 0.53, denoting a perspective of genetic improvement through selection and corrective matings for purebred Dairy Gir populations. The average genetic changes in conformation and management traits were, in general, variable and inexpressive, showing that the selection of Dairy Gir may have had been directed essentially to increase milk yield. The analysis of the two periods of birth indicated that some linear traits present progress (although inexpressive) in the 2nd period (more recent period). |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-08-01 |
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=S0102-09352021000400938 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352021000400938 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/1678-4162-12341 |
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 |
Universidade Federal de Minas Gerais, Escola de Veterinária |
publisher.none.fl_str_mv |
Universidade Federal de Minas Gerais, Escola de Veterinária |
dc.source.none.fl_str_mv |
Arquivo Brasileiro de Medicina Veterinária e Zootecnia v.73 n.4 2021 reponame:Arquivo brasileiro de medicina veterinária e zootecnia (Online) instname:Universidade Federal de Minas Gerais (UFMG) instacron:UFMG |
instname_str |
Universidade Federal de Minas Gerais (UFMG) |
instacron_str |
UFMG |
institution |
UFMG |
reponame_str |
Arquivo brasileiro de medicina veterinária e zootecnia (Online) |
collection |
Arquivo brasileiro de medicina veterinária e zootecnia (Online) |
repository.name.fl_str_mv |
Arquivo brasileiro de medicina veterinária e zootecnia (Online) - Universidade Federal de Minas Gerais (UFMG) |
repository.mail.fl_str_mv |
journal@vet.ufmg.br||abmvz.artigo@abmvz.org.br |
_version_ |
1750220895514787840 |