Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/14703 |
Resumo: | Birth weight (BW) and body weights at 205 (WW), 365 (YW) and 550 days (EW) of Nellore cattle raised on pastures were analysed. The animals were born from 30 herds of north São Paulo State, from 1976 throught 1981. The least squares means (kg) for BW, WW, YW and EW were respectively 28.6, 148.8, 206.8 and 265.2. Males BW, WW, YW and EW were superior to the same female measurements (P<.01). Only BW was not affected by year of birth. Otherwise WW, YW and EW decreased (P<.01) along time. Calves born during first season (Oct-December) had the greatest BW (P<.05). Those from fourth season (Jul-September) were the heaviest at weaning. For YW the maximum was obtained by animals from third season (Apr-June). Calves born from July throught December had greater EW (P<.05) than those from second season and third. The year x season interaction was significant for BW (P<.05) and for WW, YW and EW (P<.01). Herd and sire/herd affected all body weights and the age of dam had a quadratic influence (P<.01) on BW and WW. The heritability estimates for BW.WW. YW and EW, were respectively, 34±.04;.26±04;,29±06;and.25±.08. Four selection criteria were discussed, based on the direct and correlated genetic response and selection of animals at 365 days was suggested. |
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Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, BrazilAnálise de pesos de bovinos Nelore criados a pasto no estado de São Paulo, Brasilbeef cattle; zebu; heritability; genetic correlations; animal breeding; selection; genetic responsegado de corte; zebu; herdabilidade; correlações genéticas; melhoramento animal; seleção; ganho genéticoBirth weight (BW) and body weights at 205 (WW), 365 (YW) and 550 days (EW) of Nellore cattle raised on pastures were analysed. The animals were born from 30 herds of north São Paulo State, from 1976 throught 1981. The least squares means (kg) for BW, WW, YW and EW were respectively 28.6, 148.8, 206.8 and 265.2. Males BW, WW, YW and EW were superior to the same female measurements (P<.01). Only BW was not affected by year of birth. Otherwise WW, YW and EW decreased (P<.01) along time. Calves born during first season (Oct-December) had the greatest BW (P<.05). Those from fourth season (Jul-September) were the heaviest at weaning. For YW the maximum was obtained by animals from third season (Apr-June). Calves born from July throught December had greater EW (P<.05) than those from second season and third. The year x season interaction was significant for BW (P<.05) and for WW, YW and EW (P<.01). Herd and sire/herd affected all body weights and the age of dam had a quadratic influence (P<.01) on BW and WW. The heritability estimates for BW.WW. YW and EW, were respectively, 34±.04;.26±04;,29±06;and.25±.08. Four selection criteria were discussed, based on the direct and correlated genetic response and selection of animals at 365 days was suggested.Foram analisados neste trabalho os dados do controle de desenvolvimento ponderal da raça Nelore executado no Estado de São Paulo. Participaram da amostra principal 5.483 animais, nascidos no período de 1976 a 1981, criados em regime de pasto em 30 fazendas. As médias de quadrados mínimos dos pesos ao nascer (PN), aos 205 (PD), 365 (PA) e aos 550 dias de idade (PS) foram, respectivamente, 28,6, 148,8, 206,8 e 265,2 kg. Foi evidenciada a influência do sexo (P<0,01) sendo os machos superiores às fêmeas em todos os pesos. Somente os PN não sofreram efeito do ano de nascimento (P>0,05), sendo, entretanto decrescentes, ao longo dos anos, as médias dos PD, PA e PS (P<0,01). Os animais nascidos na primeira época (out-dez) foram mais pesados ao nascer que os demais (P<0,05). Os maiores PD foram observados em animais nascidos na quarta época (jul-set), os maiores PA na terceira época (abr-jun) e os maiores PS nas épocas primeira (out-dez) e quarta (jul-set) (P<0,05). A interação ano x estação de nascimento afetou significativamente tanto PN (P<0,05) como PD, PA e PS (P<0,01). Os efeitos de fazenda e de reprodutor/fazenda foram significativos para todos os pesos estudados. A idade da mãe ao parto influiu de forma quadrática o PN e PD (P<0,01). As estimativas de herdabilidade de PN, PD, PA e PS foram, respectivamente 0,34±0,04; 0,26±0,04; 0,29±0,06 e 0,25±0,08. São discutidos quatro critérios de seleção, com base nas respostas diretas e correlacionadas, sendo sugerida a seleção dos animais a um ano de idade.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraSilva, Luiz Otávio C. daRosa, Antonio do N.Nobre, Paulo Roberto C.Milagres, João C.Evangelista, Silvio Roberto M.2014-04-17info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/14703Pesquisa Agropecuaria Brasileira; v.22, n.11/12, nov./dez. 1987; 1245-1256Pesquisa Agropecuária Brasileira; v.22, n.11/12, nov./dez. 1987; 1245-12561678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/14703/8390info:eu-repo/semantics/openAccess2014-10-16T17:28:06Zoai:ojs.seer.sct.embrapa.br:article/14703Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-10-16T17:28:06Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil Análise de pesos de bovinos Nelore criados a pasto no estado de São Paulo, Brasil |
title |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
spellingShingle |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil Silva, Luiz Otávio C. da beef cattle; zebu; heritability; genetic correlations; animal breeding; selection; genetic response gado de corte; zebu; herdabilidade; correlações genéticas; melhoramento animal; seleção; ganho genético |
title_short |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
title_full |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
title_fullStr |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
title_full_unstemmed |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
title_sort |
Genetic and environmental factors affecting body weight of Nellore cattle raised on pastures in São Paulo state, Brazil |
author |
Silva, Luiz Otávio C. da |
author_facet |
Silva, Luiz Otávio C. da Rosa, Antonio do N. Nobre, Paulo Roberto C. Milagres, João C. Evangelista, Silvio Roberto M. |
author_role |
author |
author2 |
Rosa, Antonio do N. Nobre, Paulo Roberto C. Milagres, João C. Evangelista, Silvio Roberto M. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
|
dc.contributor.author.fl_str_mv |
Silva, Luiz Otávio C. da Rosa, Antonio do N. Nobre, Paulo Roberto C. Milagres, João C. Evangelista, Silvio Roberto M. |
dc.subject.por.fl_str_mv |
beef cattle; zebu; heritability; genetic correlations; animal breeding; selection; genetic response gado de corte; zebu; herdabilidade; correlações genéticas; melhoramento animal; seleção; ganho genético |
topic |
beef cattle; zebu; heritability; genetic correlations; animal breeding; selection; genetic response gado de corte; zebu; herdabilidade; correlações genéticas; melhoramento animal; seleção; ganho genético |
description |
Birth weight (BW) and body weights at 205 (WW), 365 (YW) and 550 days (EW) of Nellore cattle raised on pastures were analysed. The animals were born from 30 herds of north São Paulo State, from 1976 throught 1981. The least squares means (kg) for BW, WW, YW and EW were respectively 28.6, 148.8, 206.8 and 265.2. Males BW, WW, YW and EW were superior to the same female measurements (P<.01). Only BW was not affected by year of birth. Otherwise WW, YW and EW decreased (P<.01) along time. Calves born during first season (Oct-December) had the greatest BW (P<.05). Those from fourth season (Jul-September) were the heaviest at weaning. For YW the maximum was obtained by animals from third season (Apr-June). Calves born from July throught December had greater EW (P<.05) than those from second season and third. The year x season interaction was significant for BW (P<.05) and for WW, YW and EW (P<.01). Herd and sire/herd affected all body weights and the age of dam had a quadratic influence (P<.01) on BW and WW. The heritability estimates for BW.WW. YW and EW, were respectively, 34±.04;.26±04;,29±06;and.25±.08. Four selection criteria were discussed, based on the direct and correlated genetic response and selection of animals at 365 days was suggested. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014-04-17 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/14703 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/14703 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/14703/8390 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.22, n.11/12, nov./dez. 1987; 1245-1256 Pesquisa Agropecuária Brasileira; v.22, n.11/12, nov./dez. 1987; 1245-1256 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416715786256384 |