Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach

Detalhes bibliográficos
Autor(a) principal: Canellas,Leonardo Canali
Data de Publicação: 2012
Outros Autores: Barcellos,Júlio Otávio Jardim, Nunes,Luciana Neves, Oliveira,Tamara Esteves de, Prates,Ênio Rosa, Darde,Daniel Chamorro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista Brasileira de Zootecnia (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700011
Resumo: The objective of this study was to evaluate, using meta-analysis, the main factors related to post-weaning body weight and weight gain that affect pregnancy rate of heifers bred at 18 months of age. Data of 1398 beef heifers from six experiments were analyzed as a set. Information related to methodology and results of each experiment were codified in Microsoft Excel spreadsheets. The independent variables analyzed were: body weight at seven months of age (BW7M), daily weight gain from seven to 12 months (DWG7-12), body weight at 12 months of age (BW12M), daily weight gain from 12 to 15 months (DWG12-15), body weight at 15 months of age (BW15M), daily weight gain from 15 to 18 months (DWG15-18), daily weight gain from 7 to 18 months (DWG7-18) and body weight at 18 months of age (BW18M). The response variable was pregnancy rate (PR). Body weight at 18 months of age and DWG7-18 showed high correlation with PR and between each other. The other variables presented low correlation with PR. Body weight at first breeding and daily weight gain from seven to 18 months are the most important variables affecting the pregnancy rate of heifers bred at 18 months of age in the autumn. Weaning weight and weight gain during intermediate steps of the post-weaning period are not good predictors of pregnancy rate. Higher pregnancy rates can be obtained provided enough post-weaning weight gain and minimum body weight at first breeding are achieved, irrespective of when weight is gained.
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spelling Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approachbody weightmatingyearlingThe objective of this study was to evaluate, using meta-analysis, the main factors related to post-weaning body weight and weight gain that affect pregnancy rate of heifers bred at 18 months of age. Data of 1398 beef heifers from six experiments were analyzed as a set. Information related to methodology and results of each experiment were codified in Microsoft Excel spreadsheets. The independent variables analyzed were: body weight at seven months of age (BW7M), daily weight gain from seven to 12 months (DWG7-12), body weight at 12 months of age (BW12M), daily weight gain from 12 to 15 months (DWG12-15), body weight at 15 months of age (BW15M), daily weight gain from 15 to 18 months (DWG15-18), daily weight gain from 7 to 18 months (DWG7-18) and body weight at 18 months of age (BW18M). The response variable was pregnancy rate (PR). Body weight at 18 months of age and DWG7-18 showed high correlation with PR and between each other. The other variables presented low correlation with PR. Body weight at first breeding and daily weight gain from seven to 18 months are the most important variables affecting the pregnancy rate of heifers bred at 18 months of age in the autumn. Weaning weight and weight gain during intermediate steps of the post-weaning period are not good predictors of pregnancy rate. Higher pregnancy rates can be obtained provided enough post-weaning weight gain and minimum body weight at first breeding are achieved, irrespective of when weight is gained.Sociedade Brasileira de Zootecnia2012-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700011Revista Brasileira de Zootecnia v.41 n.7 2012reponame:Revista Brasileira de Zootecnia (Online)instname:Sociedade Brasileira de Zootecnia (SBZ)instacron:SBZ10.1590/S1516-35982012000700011info:eu-repo/semantics/openAccessCanellas,Leonardo CanaliBarcellos,Júlio Otávio JardimNunes,Luciana NevesOliveira,Tamara Esteves dePrates,Ênio RosaDarde,Daniel Chamorroeng2012-07-30T00:00:00Zoai:scielo:S1516-35982012000700011Revistahttps://www.rbz.org.br/pt-br/https://old.scielo.br/oai/scielo-oai.php||bz@sbz.org.br|| secretariarbz@sbz.org.br1806-92901516-3598opendoar:2012-07-30T00:00Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)false
dc.title.none.fl_str_mv Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
title Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
spellingShingle Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
Canellas,Leonardo Canali
body weight
mating
yearling
title_short Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
title_full Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
title_fullStr Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
title_full_unstemmed Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
title_sort Post-weaning weight gain and pregnancy rate of beef heifers bred at 18 months of age: a meta-analysis approach
author Canellas,Leonardo Canali
author_facet Canellas,Leonardo Canali
Barcellos,Júlio Otávio Jardim
Nunes,Luciana Neves
Oliveira,Tamara Esteves de
Prates,Ênio Rosa
Darde,Daniel Chamorro
author_role author
author2 Barcellos,Júlio Otávio Jardim
Nunes,Luciana Neves
Oliveira,Tamara Esteves de
Prates,Ênio Rosa
Darde,Daniel Chamorro
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Canellas,Leonardo Canali
Barcellos,Júlio Otávio Jardim
Nunes,Luciana Neves
Oliveira,Tamara Esteves de
Prates,Ênio Rosa
Darde,Daniel Chamorro
dc.subject.por.fl_str_mv body weight
mating
yearling
topic body weight
mating
yearling
description The objective of this study was to evaluate, using meta-analysis, the main factors related to post-weaning body weight and weight gain that affect pregnancy rate of heifers bred at 18 months of age. Data of 1398 beef heifers from six experiments were analyzed as a set. Information related to methodology and results of each experiment were codified in Microsoft Excel spreadsheets. The independent variables analyzed were: body weight at seven months of age (BW7M), daily weight gain from seven to 12 months (DWG7-12), body weight at 12 months of age (BW12M), daily weight gain from 12 to 15 months (DWG12-15), body weight at 15 months of age (BW15M), daily weight gain from 15 to 18 months (DWG15-18), daily weight gain from 7 to 18 months (DWG7-18) and body weight at 18 months of age (BW18M). The response variable was pregnancy rate (PR). Body weight at 18 months of age and DWG7-18 showed high correlation with PR and between each other. The other variables presented low correlation with PR. Body weight at first breeding and daily weight gain from seven to 18 months are the most important variables affecting the pregnancy rate of heifers bred at 18 months of age in the autumn. Weaning weight and weight gain during intermediate steps of the post-weaning period are not good predictors of pregnancy rate. Higher pregnancy rates can be obtained provided enough post-weaning weight gain and minimum body weight at first breeding are achieved, irrespective of when weight is gained.
publishDate 2012
dc.date.none.fl_str_mv 2012-07-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700011
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000700011
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-35982012000700011
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia
publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia
dc.source.none.fl_str_mv Revista Brasileira de Zootecnia v.41 n.7 2012
reponame:Revista Brasileira de Zootecnia (Online)
instname:Sociedade Brasileira de Zootecnia (SBZ)
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instname_str Sociedade Brasileira de Zootecnia (SBZ)
instacron_str SBZ
institution SBZ
reponame_str Revista Brasileira de Zootecnia (Online)
collection Revista Brasileira de Zootecnia (Online)
repository.name.fl_str_mv Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)
repository.mail.fl_str_mv ||bz@sbz.org.br|| secretariarbz@sbz.org.br
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