Calving sub-season and reproductive efficiency of beef cows

Detalhes bibliográficos
Autor(a) principal: Reinher,Cristiane
Data de Publicação: 2010
Outros Autores: Barcellos,Júlio Otávio Jardim, Peripolli,Vanessa, Prates,Ênio Rosa, Canozzi,Maria Eugênia Andrighetto
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=S1516-35982010001000012
Resumo: It was evaluated in this work the effect of calving sub-season on the pregnancy rate of 7,726 multiparous Hereford beef cows grazing on natural pastures in southern Brazil, from 1994 to 2007. Calving sub-season periods were divided in 20-day intervals from August 12th to 31st; from September 1st to 20th; from September 21st to October 10th; from October 11th to 31st; from November 1st to 20th. Calving in each sub-season and pregnancy rate (PR) were analyzed by the Chi-square test. Overall means of each sub-season were 92.7% (from August 12th to 31st), 90.6% (from September 1st to 20th), 82.1% (from September 21st to October 10th), 77.7% (from October 11th to 31st), and 70.6% (from November 1st to 20th). Calving sub-season significantly influenced pregnancy rate. Cows which calved in the initial sub-season showed higher pregnancy rates than cows which calved from the fourth calving sub-season. However this difference did not occur in 1999 and in 2007 since calving rates did not statistically differ among the five sub-seasons. In 1998 and 2004, calving rates were lower and the effects of calving sub-season on pregnancy rates were higher, possibly due to climate variations. In general, pregnancy rate decreases as calving occurs later in the year, particularly in years when the weather adversely affects pasture growth.
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spelling Calving sub-season and reproductive efficiency of beef cowscalving datecow-calfmultiparouspregnancy rateIt was evaluated in this work the effect of calving sub-season on the pregnancy rate of 7,726 multiparous Hereford beef cows grazing on natural pastures in southern Brazil, from 1994 to 2007. Calving sub-season periods were divided in 20-day intervals from August 12th to 31st; from September 1st to 20th; from September 21st to October 10th; from October 11th to 31st; from November 1st to 20th. Calving in each sub-season and pregnancy rate (PR) were analyzed by the Chi-square test. Overall means of each sub-season were 92.7% (from August 12th to 31st), 90.6% (from September 1st to 20th), 82.1% (from September 21st to October 10th), 77.7% (from October 11th to 31st), and 70.6% (from November 1st to 20th). Calving sub-season significantly influenced pregnancy rate. Cows which calved in the initial sub-season showed higher pregnancy rates than cows which calved from the fourth calving sub-season. However this difference did not occur in 1999 and in 2007 since calving rates did not statistically differ among the five sub-seasons. In 1998 and 2004, calving rates were lower and the effects of calving sub-season on pregnancy rates were higher, possibly due to climate variations. In general, pregnancy rate decreases as calving occurs later in the year, particularly in years when the weather adversely affects pasture growth.Sociedade Brasileira de Zootecnia2010-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000012Revista Brasileira de Zootecnia v.39 n.10 2010reponame:Revista Brasileira de Zootecnia (Online)instname:Sociedade Brasileira de Zootecnia (SBZ)instacron:SBZ10.1590/S1516-35982010001000012info:eu-repo/semantics/openAccessReinher,CristianeBarcellos,Júlio Otávio JardimPeripolli,VanessaPrates,Ênio RosaCanozzi,Maria Eugênia Andrighettoeng2010-10-25T00:00:00Zoai:scielo:S1516-35982010001000012Revistahttps://www.rbz.org.br/pt-br/https://old.scielo.br/oai/scielo-oai.php||bz@sbz.org.br|| secretariarbz@sbz.org.br1806-92901516-3598opendoar:2010-10-25T00:00Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)false
dc.title.none.fl_str_mv Calving sub-season and reproductive efficiency of beef cows
title Calving sub-season and reproductive efficiency of beef cows
spellingShingle Calving sub-season and reproductive efficiency of beef cows
Reinher,Cristiane
calving date
cow-calf
multiparous
pregnancy rate
title_short Calving sub-season and reproductive efficiency of beef cows
title_full Calving sub-season and reproductive efficiency of beef cows
title_fullStr Calving sub-season and reproductive efficiency of beef cows
title_full_unstemmed Calving sub-season and reproductive efficiency of beef cows
title_sort Calving sub-season and reproductive efficiency of beef cows
author Reinher,Cristiane
author_facet Reinher,Cristiane
Barcellos,Júlio Otávio Jardim
Peripolli,Vanessa
Prates,Ênio Rosa
Canozzi,Maria Eugênia Andrighetto
author_role author
author2 Barcellos,Júlio Otávio Jardim
Peripolli,Vanessa
Prates,Ênio Rosa
Canozzi,Maria Eugênia Andrighetto
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Reinher,Cristiane
Barcellos,Júlio Otávio Jardim
Peripolli,Vanessa
Prates,Ênio Rosa
Canozzi,Maria Eugênia Andrighetto
dc.subject.por.fl_str_mv calving date
cow-calf
multiparous
pregnancy rate
topic calving date
cow-calf
multiparous
pregnancy rate
description It was evaluated in this work the effect of calving sub-season on the pregnancy rate of 7,726 multiparous Hereford beef cows grazing on natural pastures in southern Brazil, from 1994 to 2007. Calving sub-season periods were divided in 20-day intervals from August 12th to 31st; from September 1st to 20th; from September 21st to October 10th; from October 11th to 31st; from November 1st to 20th. Calving in each sub-season and pregnancy rate (PR) were analyzed by the Chi-square test. Overall means of each sub-season were 92.7% (from August 12th to 31st), 90.6% (from September 1st to 20th), 82.1% (from September 21st to October 10th), 77.7% (from October 11th to 31st), and 70.6% (from November 1st to 20th). Calving sub-season significantly influenced pregnancy rate. Cows which calved in the initial sub-season showed higher pregnancy rates than cows which calved from the fourth calving sub-season. However this difference did not occur in 1999 and in 2007 since calving rates did not statistically differ among the five sub-seasons. In 1998 and 2004, calving rates were lower and the effects of calving sub-season on pregnancy rates were higher, possibly due to climate variations. In general, pregnancy rate decreases as calving occurs later in the year, particularly in years when the weather adversely affects pasture growth.
publishDate 2010
dc.date.none.fl_str_mv 2010-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000012
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001000012
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1516-35982010001000012
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 Zootecnia
publisher.none.fl_str_mv Sociedade Brasileira de Zootecnia
dc.source.none.fl_str_mv Revista Brasileira de Zootecnia v.39 n.10 2010
reponame:Revista Brasileira de Zootecnia (Online)
instname:Sociedade Brasileira de Zootecnia (SBZ)
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collection Revista Brasileira de Zootecnia (Online)
repository.name.fl_str_mv Revista Brasileira de Zootecnia (Online) - Sociedade Brasileira de Zootecnia (SBZ)
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