Genetic improvement and population structure of the Nelore breed in Northern Brazil

The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.

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Main Authors: Malhado,Carlos Henrique Mendes, Carneiro,Paulo Luiz Souza, Malhado,Ana Claudia Mendes, Martins Filho,Raimundo, Bozzi,Riccardo, Ladle,Richard James
Format: Digital revista
Language:English
Published: Embrapa Secretaria de Pesquisa e Desenvolvimento 2010
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009
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spelling oai:scielo:S0100-204X20100010000092010-12-21Genetic improvement and population structure of the Nelore breed in Northern BrazilMalhado,Carlos Henrique MendesCarneiro,Paulo Luiz SouzaMalhado,Ana Claudia MendesMartins Filho,RaimundoBozzi,RiccardoLadle,Richard James Bos taurus indicus effective population size genetic parameters genetic trends inbreeding pedigree analysis The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.info:eu-repo/semantics/openAccessEmbrapa Secretaria de Pesquisa e DesenvolvimentoPesquisa Agropecuária BrasileiraPesquisa Agropecuária Brasileira v.45 n.10 20102010-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009en10.1590/S0100-204X2010001000009
institution SCIELO
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country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
tag revista
region America del Sur
libraryname SciELO
language English
format Digital
author Malhado,Carlos Henrique Mendes
Carneiro,Paulo Luiz Souza
Malhado,Ana Claudia Mendes
Martins Filho,Raimundo
Bozzi,Riccardo
Ladle,Richard James
spellingShingle Malhado,Carlos Henrique Mendes
Carneiro,Paulo Luiz Souza
Malhado,Ana Claudia Mendes
Martins Filho,Raimundo
Bozzi,Riccardo
Ladle,Richard James
Genetic improvement and population structure of the Nelore breed in Northern Brazil
author_facet Malhado,Carlos Henrique Mendes
Carneiro,Paulo Luiz Souza
Malhado,Ana Claudia Mendes
Martins Filho,Raimundo
Bozzi,Riccardo
Ladle,Richard James
author_sort Malhado,Carlos Henrique Mendes
title Genetic improvement and population structure of the Nelore breed in Northern Brazil
title_short Genetic improvement and population structure of the Nelore breed in Northern Brazil
title_full Genetic improvement and population structure of the Nelore breed in Northern Brazil
title_fullStr Genetic improvement and population structure of the Nelore breed in Northern Brazil
title_full_unstemmed Genetic improvement and population structure of the Nelore breed in Northern Brazil
title_sort genetic improvement and population structure of the nelore breed in northern brazil
description The objective of this work was to evaluate the population structure and the genetic and phenotypic progress of Nelore cattle in Northern Brazil. Pedigree information concerning animals born between 1942 and 2006 were analyzed. Population structure was performed using the Endog program. Out of the 140,628 animals studied, 67.7, 14.52 and 3.18% had complete pedigree record of the first, second and third parental generation, respectively. Inbreeding and average relatedness coefficients were low: 0.2 and 0.13%, respectively. However, these parameters may have been underestimated, since information on pedigree was incomplete. The effective number of founders was 370 and the genetic contribution of 10, 50 and 448 most influent ancestors explained 13.2, 28 and 50% of the genetic variability in the population, respectively. The genetic variability for growth traits and population structure demonstrates high probability of increasing productivity through selective breeding. Moreover, management strategies to reduce the currently observed age at first calving and generation intervals are important for Nelore cattle genetic improvement.
publisher Embrapa Secretaria de Pesquisa e Desenvolvimento
publishDate 2010
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000009
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