Variables affecting gestation period in gir dairy cattle

Detalhes bibliográficos
Autor(a) principal: Aroeira, José Antonio D. C.
Data de Publicação: 2014
Outros Autores: Sampaio, Ivan B. M.
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/16498
Resumo: Nine hundred and thirty four (934) gestation periods from a Gir herd under selection as dairy cattle, were studied to detect probable influences on parity years (1954/1972), calf weight and sex, season and sex, season and parity. Average gestation period was 286 days with a standard deviation of 11.4. The selected mathematical model was: estimated periods = 292.98 - 0.29 (parity)2 + 2.34 (parity) + 0.49 (weight of calf) 0.31 (year of parturition) where all variables were significant (P<0.05). Maximun gestation length was reached at parity four (288 days), as curvilinear effect was observed. Sex effect was probably absorbed in variable weight and all contrasts involving seasonal effect were not significant.
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spelling Variables affecting gestation period in gir dairy cattleDuração da gestação em gado zebudairy cattle; Gir herd; regression analysis; gestation period; calf weight; zebu herdgado leiteiro; Gir; análise de regressão; período gestação; peso bezerroNine hundred and thirty four (934) gestation periods from a Gir herd under selection as dairy cattle, were studied to detect probable influences on parity years (1954/1972), calf weight and sex, season and sex, season and parity. Average gestation period was 286 days with a standard deviation of 11.4. The selected mathematical model was: estimated periods = 292.98 - 0.29 (parity)2 + 2.34 (parity) + 0.49 (weight of calf) 0.31 (year of parturition) where all variables were significant (P<0.05). Maximun gestation length was reached at parity four (288 days), as curvilinear effect was observed. Sex effect was probably absorbed in variable weight and all contrasts involving seasonal effect were not significant.De um rebanho predominantemente Gir e selecionado para a produção de leite, foram estudados 938 períodos de gestação, para conhecer-se as possíveis influências do ano da parição (1954/1972). peso e sexo do bezerro, estação do ano e ordem de parição sobre a duração dos mesmos. O período médio de gestação encontrado foi de 286,8 dias, com um desvio-padrão de 11,4. O modelo matemático selecionado foi: período de gestação = 292,98 - 0,29 (ordem de parição)2 + 2,34 (ordem de parição)+ 0,49 (peso do bezerro) - 0.31 (ano de parição), onde todas as variáveis foram significativas (P=<0,05). O maior período de gestação ocorreu na quarta parição (288 dias). O efeito "sexo" foi possivelmente encoberto pela variável "peso", e os contrastes envolvendo efeito de estação não foram significativos.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraAroeira, José Antonio D. C.Sampaio, Ivan B. M.2014-04-15info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16498Pesquisa Agropecuaria Brasileira; v.15, n.2, fev. 1980; 167-169Pesquisa Agropecuária Brasileira; v.15, n.2, fev. 1980; 167-1691678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/16498/10779info:eu-repo/semantics/openAccess2014-04-15T19:32:17Zoai:ojs.seer.sct.embrapa.br:article/16498Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-15T19:32:17Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Variables affecting gestation period in gir dairy cattle
Duração da gestação em gado zebu
title Variables affecting gestation period in gir dairy cattle
spellingShingle Variables affecting gestation period in gir dairy cattle
Aroeira, José Antonio D. C.
dairy cattle; Gir herd; regression analysis; gestation period; calf weight; zebu herd
gado leiteiro; Gir; análise de regressão; período gestação; peso bezerro
title_short Variables affecting gestation period in gir dairy cattle
title_full Variables affecting gestation period in gir dairy cattle
title_fullStr Variables affecting gestation period in gir dairy cattle
title_full_unstemmed Variables affecting gestation period in gir dairy cattle
title_sort Variables affecting gestation period in gir dairy cattle
author Aroeira, José Antonio D. C.
author_facet Aroeira, José Antonio D. C.
Sampaio, Ivan B. M.
author_role author
author2 Sampaio, Ivan B. M.
author2_role author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Aroeira, José Antonio D. C.
Sampaio, Ivan B. M.
dc.subject.por.fl_str_mv dairy cattle; Gir herd; regression analysis; gestation period; calf weight; zebu herd
gado leiteiro; Gir; análise de regressão; período gestação; peso bezerro
topic dairy cattle; Gir herd; regression analysis; gestation period; calf weight; zebu herd
gado leiteiro; Gir; análise de regressão; período gestação; peso bezerro
description Nine hundred and thirty four (934) gestation periods from a Gir herd under selection as dairy cattle, were studied to detect probable influences on parity years (1954/1972), calf weight and sex, season and sex, season and parity. Average gestation period was 286 days with a standard deviation of 11.4. The selected mathematical model was: estimated periods = 292.98 - 0.29 (parity)2 + 2.34 (parity) + 0.49 (weight of calf) 0.31 (year of parturition) where all variables were significant (P<0.05). Maximun gestation length was reached at parity four (288 days), as curvilinear effect was observed. Sex effect was probably absorbed in variable weight and all contrasts involving seasonal effect were not significant.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-15
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/16498
url https://seer.sct.embrapa.br/index.php/pab/article/view/16498
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/16498/10779
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.15, n.2, fev. 1980; 167-169
Pesquisa Agropecuária Brasileira; v.15, n.2, fev. 1980; 167-169
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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